12021131031 has 16 divisors (see below), whose sum is σ = 19726984704. Its totient is φ = 6340816224.

The previous prime is 12021131009. The next prime is 12021131039. The reversal of 12021131031 is 13013112021.

It is a happy number.

It is not a de Polignac number, because 12021131031 - 2⁷ = 12021130903 is a prime.

It is a super-2 number, since 2×12021131031² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12021131031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021131039) 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, 22016451 + ... + 22016996.

It is an arithmetic number, because the mean of its divisors is an integer number (1232936544).

Almost surely, 2^12021131031 is an apocalyptic number.

12021131031 is a deficient number, since it is larger than the sum of its proper divisors (7705853673).

12021131031 is a wasteful number, since it uses less digits than its factorization.

12021131031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44033470.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 12021131031 its reverse (13013112021), we get a palindrome (25034243052).

The spelling of 12021131031 in words is "twelve billion, twenty-one million, one hundred thirty-one thousand, thirty-one".