31011213031021 has 16 divisors (see below), whose sum is σ = 31343250883120. Its totient is φ = 30680052480000.

The previous prime is 31011213030977. The next prime is 31011213031031. The reversal of 31011213031021 is 12013031211013.

It can be written as a sum of positive squares in 8 ways, for example, as 492328158921 + 30518884872100 = 701661^2 + 5524390^2 .

It is a cyclic number.

It is not a de Polignac number, because 31011213031021 - 2⁷ = 31011213030893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31011213031021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31011213031031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590652271 + ... + 590704771.

It is an arithmetic number, because the mean of its divisors is an integer number (1958953180195).

Almost surely, 2^{31011213031021} is an apocalyptic number.

It is an amenable number.

31011213031021 is a deficient number, since it is larger than the sum of its proper divisors (332037852099).

31011213031021 is a wasteful number, since it uses less digits than its factorization.

31011213031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60736.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 31011213031021 its reverse (12013031211013), we get a palindrome (43024244242034).

The spelling of 31011213031021 in words is "thirty-one trillion, eleven billion, two hundred thirteen million, thirty-one thousand, twenty-one".