31221129438444 has 48 divisors (see below), whose sum is σ = 79609699080576. Its totient is φ = 9444551500800.

The previous prime is 31221129438431. The next prime is 31221129438451. The reversal of 31221129438444 is 44483492112213.

It is a super-2 number, since 2×31221129438444² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31221129438393 and 31221129438402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204883722 + ... + 205036049.

It is an arithmetic number, because the mean of its divisors is an integer number (1658535397512).

Almost surely, 2^{31221129438444} is an apocalyptic number.

It is an amenable number.

31221129438444 is an abundant number, since it is smaller than the sum of its proper divisors (48388569642132).

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

31221129438444 is a wasteful number, since it uses less digits than its factorization.

31221129438444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409920366 (or 409920364 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 48.

The spelling of 31221129438444 in words is "thirty-one trillion, two hundred twenty-one billion, one hundred twenty-nine million, four hundred thirty-eight thousand, four hundred forty-four".