11131512021 has 16 divisors (see below), whose sum is σ = 18847004800. Its totient is φ = 6360863904.

The previous prime is 11131512017. The next prime is 11131512043. The reversal of 11131512021 is 12021513111.

11131512021 is a `hidden beast` number, since 1 + 1 + 131 + 512 + 0 + 21 = 666.

It is not a de Polignac number, because 11131512021 - 2² = 11131512017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11131511985 and 11131512003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11131512001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29448256 + ... + 29448633.

It is an arithmetic number, because the mean of its divisors is an integer number (1177937800).

Almost surely, 2^11131512021 is an apocalyptic number.

It is an amenable number.

11131512021 is a deficient number, since it is larger than the sum of its proper divisors (7715492779).

11131512021 is an equidigital number, since it uses as much as digits as its factorization.

11131512021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58896905 (or 58896899 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 18.

The spelling of 11131512021 in words is "eleven billion, one hundred thirty-one million, five hundred twelve thousand, twenty-one".