31221004222320 has 80 divisors (see below), whose sum is σ = 105583759742592. Its totient is φ = 7568728295680.

The previous prime is 31221004222319. The next prime is 31221004222403. The reversal of 31221004222320 is 2322240012213.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×31221004222320² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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, 5913066342 + ... + 5913071621.

Almost surely, 2^{31221004222320} is an apocalyptic number.

31221004222320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31221004222320 is an abundant number, since it is smaller than the sum of its proper divisors (74362755520272).

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

31221004222320 is a wasteful number, since it uses less digits than its factorization.

31221004222320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11826137990 (or 11826137984 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 31221004222320 its reverse (2322240012213), we get a palindrome (33543244234533).

The spelling of 31221004222320 in words is "thirty-one trillion, two hundred twenty-one billion, four million, two hundred twenty-two thousand, three hundred twenty".