31213102221213 has 32 divisors (see below), whose sum is σ = 46977395351040. Its totient is φ = 18260453346240.

The previous prime is 31213102221199. The next prime is 31213102221251. The reversal of 31213102221213 is 31212220131213.

It is not a de Polignac number, because 31213102221213 - 2¹⁷ = 31213102090141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213102221283) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 291270 + ... + 7906392.

It is an arithmetic number, because the mean of its divisors is an integer number (1468043604720).

Almost surely, 2^{31213102221213} is an apocalyptic number.

31213102221213 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

31213102221213 is a deficient number, since it is larger than the sum of its proper divisors (15764293129827).

31213102221213 is a wasteful number, since it uses less digits than its factorization.

31213102221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7619449.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 31213102221213 its reverse (31212220131213), we get a palindrome (62425322352426).

Subtracting from 31213102221213 its reverse (31212220131213), we obtain a square (882090000 = 29700²).

The spelling of 31213102221213 in words is "thirty-one trillion, two hundred thirteen billion, one hundred two million, two hundred twenty-one thousand, two hundred thirteen".