31321530644420 has 12 divisors (see below), whose sum is σ = 65775214353324. Its totient is φ = 12528612257760.

The previous prime is 31321530644399. The next prime is 31321530644431. The reversal of 31321530644420 is 2444603512313.

It can be written as a sum of positive squares in 2 ways, for example, as 21523215833344 + 9798314811076 = 4639312^2 + 3130226^2 .

It is a super-4 number, since 4×31321530644420⁴ (a number of 55 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783038266091 + ... + 783038266130.

It is an arithmetic number, because the mean of its divisors is an integer number (5481267862777).

Almost surely, 2^{31321530644420} is an apocalyptic number.

It is an amenable number.

31321530644420 is an abundant number, since it is smaller than the sum of its proper divisors (34453683708904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31321530644420 is a wasteful number, since it uses less digits than its factorization.

31321530644420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566076532230 (or 1566076532228 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 38.

The spelling of 31321530644420 in words is "thirty-one trillion, three hundred twenty-one billion, five hundred thirty million, six hundred forty-four thousand, four hundred twenty".