31112011021 has 16 divisors (see below), whose sum is σ = 38407427968. Its totient is φ = 24541704000.

The previous prime is 31112011009. The next prime is 31112011061. The reversal of 31112011021 is 12011021113.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31112011021 - 2²¹ = 31109913869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 31112010992 and 31112011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112011061) 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, 486330 + ... + 546571.

It is an arithmetic number, because the mean of its divisors is an integer number (2400464248).

Almost surely, 2^31112011021 is an apocalyptic number.

It is an amenable number.

31112011021 is a deficient number, since it is larger than the sum of its proper divisors (7295416947).

31112011021 is a wasteful number, since it uses less digits than its factorization.

31112011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033252.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 31112011021 its reverse (12011021113), we get a palindrome (43123032134).

The spelling of 31112011021 in words is "thirty-one billion, one hundred twelve million, eleven thousand, twenty-one".