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1213033100 = 225231391301
BaseRepresentation
bin100100001001101…
…0110101010001100
310010112112110120212
41020103112222030
54441014024400
6320211301552
742026416436
oct11023265214
93115473525
101213033100
115727a87a4
1229a2aa8b8
13164408786
14b7163656
1571762335
hex484d6a8c

1213033100 has 36 divisors (see below), whose sum is σ = 2717201088. Its totient is φ = 469560000.

The previous prime is 1213033099. The next prime is 1213033109. The reversal of 1213033100 is 13303121.

It is a super-2 number, since 2×12130331002 = 2942898603391220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213033109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192551 + ... + 198750.

It is an arithmetic number, because the mean of its divisors is an integer number (75477808).

Almost surely, 21213033100 is an apocalyptic number.

1213033100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213033100 is an abundant number, since it is smaller than the sum of its proper divisors (1504167988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213033100 is a wasteful number, since it uses less digits than its factorization.

1213033100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391346 (or 391339 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 1213033100 is about 34828.6247216280. The cubic root of 1213033100 is about 1066.4918734852.

Adding to 1213033100 its reverse (13303121), we get a palindrome (1226336221).

The spelling of 1213033100 in words is "one billion, two hundred thirteen million, thirty-three thousand, one hundred".

Divisors: 1 2 4 5 10 20 25 31 50 62 100 124 155 310 620 775 1550 3100 391301 782602 1565204 1956505 3913010 7826020 9782525 12130331 19565050 24260662 39130100 48521324 60651655 121303310 242606620 303258275 606516550 1213033100