320331113029721 has 2 divisors, whose sum is σ = 320331113029722. Its totient is φ = 320331113029720.

The previous prime is 320331113029717. The next prime is 320331113029727. The reversal of 320331113029721 is 127920311133023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224820365868121 + 95510747161600 = 14994011^2 + 9772960^2 .

It is a cyclic number.

It is not a de Polignac number, because 320331113029721 - 2² = 320331113029717 is a prime.

It is a super-2 number, since 2×320331113029721² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (320331113029727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160165556514860 + 160165556514861.

It is an arithmetic number, because the mean of its divisors is an integer number (160165556514861).

Almost surely, 2^{320331113029721} is an apocalyptic number.

It is an amenable number.

320331113029721 is a deficient number, since it is larger than the sum of its proper divisors (1).

320331113029721 is an equidigital number, since it uses as much as digits as its factorization.

320331113029721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 38.

The spelling of 320331113029721 in words is "three hundred twenty trillion, three hundred thirty-one billion, one hundred thirteen million, twenty-nine thousand, seven hundred twenty-one".