31020013311021 has 24 divisors (see below), whose sum is σ = 51208316178240. Its totient is φ = 17725488183936.

The previous prime is 31020013311019. The next prime is 31020013311041. The reversal of 31020013311021 is 12011331002013.

31020013311021 is a `hidden beast` number, since 31 + 0 + 200 + 1 + 331 + 102 + 1 = 666.

It is not a de Polignac number, because 31020013311021 - 2¹ = 31020013311019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31020013310985 and 31020013311003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020013311041) 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, 1627870 + ... + 8043008.

It is an arithmetic number, because the mean of its divisors is an integer number (2133679840760).

Almost surely, 2^{31020013311021} is an apocalyptic number.

It is an amenable number.

31020013311021 is a deficient number, since it is larger than the sum of its proper divisors (20188302867219).

31020013311021 is a wasteful number, since it uses less digits than its factorization.

31020013311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6491905 (or 6491902 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31020013311021 its reverse (12011331002013), we get a palindrome (43031344313034).

The spelling of 31020013311021 in words is "thirty-one trillion, twenty billion, thirteen million, three hundred eleven thousand, twenty-one".