11231312520 has 32 divisors (see below), whose sum is σ = 33693937920. Its totient is φ = 2995016640.

The previous prime is 11231312489. The next prime is 11231312539. The reversal of 11231312520 is 2521313211.

It is a super-2 number, since 2×11231312520² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46797016 + ... + 46797255.

It is an arithmetic number, because the mean of its divisors is an integer number (1052935560).

Almost surely, 2^11231312520 is an apocalyptic number.

11231312520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11231312520 is an abundant number, since it is smaller than the sum of its proper divisors (22462625400).

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

11231312520 is a wasteful number, since it uses less digits than its factorization.

11231312520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93594285 (or 93594281 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 11231312520 its reverse (2521313211), we get a palindrome (13752625731).

The spelling of 11231312520 in words is "eleven billion, two hundred thirty-one million, three hundred twelve thousand, five hundred twenty".