631100321471021 has 12 divisors (see below), whose sum is σ = 648825000419700. Its totient is φ = 613779645536640.

The previous prime is 631100321470999. The next prime is 631100321471029. The reversal of 631100321471021 is 120174123001136.

It can be written as a sum of positive squares in 6 ways, for example, as 236784542718025 + 394315778752996 = 15387805^2 + 19857386^2 .

It is a de Polignac number, because none of the positive numbers 2^k-631100321471021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631100321471029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 952506086 + ... + 953168423.

It is an arithmetic number, because the mean of its divisors is an integer number (54068750034975).

Almost surely, 2^{631100321471021} is an apocalyptic number.

631100321471021 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

631100321471021 is a deficient number, since it is larger than the sum of its proper divisors (17724678948679).

631100321471021 is an equidigital number, since it uses as much as digits as its factorization.

631100321471021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905674720 (or 1905674659 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

Adding to 631100321471021 its reverse (120174123001136), we get a palindrome (751274444472157).

The spelling of 631100321471021 in words is "six hundred thirty-one trillion, one hundred billion, three hundred twenty-one million, four hundred seventy-one thousand, twenty-one".