31012210111021 has 16 divisors (see below), whose sum is σ = 31362960499200. Its totient is φ = 30663522979840.

The previous prime is 31012210110943. The next prime is 31012210111049. The reversal of 31012210111021 is 12011101221013.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31012210111021 - 2²³ = 31012201722413 is a prime.

It is a super-2 number, since 2×31012210111021² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31012210110986 and 31012210111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012210111321) 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, 56669376 + ... + 57214006.

It is an arithmetic number, because the mean of its divisors is an integer number (1960185031200).

Almost surely, 2^{31012210111021} is an apocalyptic number.

It is an amenable number.

31012210111021 is a deficient number, since it is larger than the sum of its proper divisors (350750388179).

31012210111021 is a wasteful number, since it uses less digits than its factorization.

31012210111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546524.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 31012210111021 its reverse (12011101221013), we get a palindrome (43023311332034).

The spelling of 31012210111021 in words is "thirty-one trillion, twelve billion, two hundred ten million, one hundred eleven thousand, twenty-one".