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1212221131 = 11110201921
BaseRepresentation
bin100100001000001…
…0000011011001011
310010111000012202221
41020100100123023
54440312034011
6320142034511
742016465252
oct11020203313
93114005687
101212221131
115722a3750
12299b78a37
131641b3014
14b6dd1799
1571651971
hex484106cb

1212221131 has 4 divisors (see below), whose sum is σ = 1322423064. Its totient is φ = 1102019200.

The previous prime is 1212221119. The next prime is 1212221149. The reversal of 1212221131 is 1311222121.

Adding to 1212221131 its reverse (1311222121), we get a palindrome (2523443252).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1212221131 is a prime.

It is a super-2 number, since 2×12122211312 = 2938960140885838322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212221191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55100950 + ... + 55100971.

It is an arithmetic number, because the mean of its divisors is an integer number (330605766).

Almost surely, 21212221131 is an apocalyptic number.

1212221131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212221131 is a deficient number, since it is larger than the sum of its proper divisors (110201933).

1212221131 is a wasteful number, since it uses less digits than its factorization.

1212221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110201932.

The product of its digits is 48, while the sum is 16.

The square root of 1212221131 is about 34816.9661372153. The cubic root of 1212221131 is about 1066.2538608463.

The spelling of 1212221131 in words is "one billion, two hundred twelve million, two hundred twenty-one thousand, one hundred thirty-one".

Divisors: 1 11 110201921 1212221131