31021102122213 has 16 divisors (see below), whose sum is σ = 49325479151616. Its totient is φ = 16955633457840.

The previous prime is 31021102122193. The next prime is 31021102122217. The reversal of 31021102122213 is 31222120112013.

It is not a de Polignac number, because 31021102122213 - 2²¹ = 31021100025061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 31021102122213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021102122217) 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, 32112941673 + ... + 32112942638.

It is an arithmetic number, because the mean of its divisors is an integer number (3082842446976).

Almost surely, 2^{31021102122213} is an apocalyptic number.

It is an amenable number.

31021102122213 is a deficient number, since it is larger than the sum of its proper divisors (18304377029403).

31021102122213 is a wasteful number, since it uses less digits than its factorization.

31021102122213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64225884344.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 31021102122213 its reverse (31222120112013), we get a palindrome (62243222234226).

The spelling of 31021102122213 in words is "thirty-one trillion, twenty-one billion, one hundred two million, one hundred twenty-two thousand, two hundred thirteen".