31332021213721 has 2 divisors, whose sum is σ = 31332021213722. Its totient is φ = 31332021213720.

The previous prime is 31332021213679. The next prime is 31332021213803. The reversal of 31332021213721 is 12731212023313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16385980161600 + 14946041052121 = 4047960^2 + 3866011^2 .

It is a cyclic number.

It is not a de Polignac number, because 31332021213721 - 2²⁵ = 31331987659289 is a prime.

It is not a weakly prime, because it can be changed into another prime (31332021213221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15666010606860 + 15666010606861.

It is an arithmetic number, because the mean of its divisors is an integer number (15666010606861).

Almost surely, 2^{31332021213721} is an apocalyptic number.

It is an amenable number.

31332021213721 is a deficient number, since it is larger than the sum of its proper divisors (1).

31332021213721 is an equidigital number, since it uses as much as digits as its factorization.

31332021213721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The spelling of 31332021213721 in words is "thirty-one trillion, three hundred thirty-two billion, twenty-one million, two hundred thirteen thousand, seven hundred twenty-one".