11220012531 has 24 divisors (see below), whose sum is σ = 19946690400. Its totient is φ = 5918247936.

The previous prime is 11220012527. The next prime is 11220012547. The reversal of 11220012531 is 13521002211.

11220012531 is a `hidden beast` number, since 1 + 122 + 0 + 0 + 12 + 531 = 666.

It is not a de Polignac number, because 11220012531 - 2² = 11220012527 is a prime.

It is a super-2 number, since 2×11220012531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11220012521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6849006 + ... + 6850643.

It is an arithmetic number, because the mean of its divisors is an integer number (831112100).

Almost surely, 2^11220012531 is an apocalyptic number.

11220012531 is a deficient number, since it is larger than the sum of its proper divisors (8726677869).

11220012531 is a wasteful number, since it uses less digits than its factorization.

11220012531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13699675 (or 13699672 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 11220012531 its reverse (13521002211), we get a palindrome (24741014742).

The spelling of 11220012531 in words is "eleven billion, two hundred twenty million, twelve thousand, five hundred thirty-one".