Search a number
-
+
20121212203 = 143871398569
BaseRepresentation
bin10010101111010100…
…010101010100101011
31220221021121111010121
4102233110111110223
5312202012242303
613124335224111
71311423324151
oct225724252453
956837544117
1020121212203
1185959995a4
123a96678037
131b88837531
14d8c4393d1
157cb7109bd
hex4af51552b

20121212203 has 4 divisors (see below), whose sum is σ = 20122625160. Its totient is φ = 20119799248.

The previous prime is 20121212183. The next prime is 20121212207. The reversal of 20121212203 is 30221212102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20121212203 - 25 = 20121212171 is a prime.

It is a super-2 number, since 2×201212122032 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121212207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 684898 + ... + 713671.

It is an arithmetic number, because the mean of its divisors is an integer number (5030656290).

Almost surely, 220121212203 is an apocalyptic number.

20121212203 is a deficient number, since it is larger than the sum of its proper divisors (1412957).

20121212203 is a wasteful number, since it uses less digits than its factorization.

20121212203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412956.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20121212203 its reverse (30221212102), we get a palindrome (50342424305).

It can be divided in two parts, 20121 and 212203, that added together give a square (232324 = 4822).

The spelling of 20121212203 in words is "twenty billion, one hundred twenty-one million, two hundred twelve thousand, two hundred three".

Divisors: 1 14387 1398569 20121212203