31321223120 has 80 divisors (see below), whose sum is σ = 80228793600. Its totient is φ = 11276736000.

The previous prime is 31321223083. The next prime is 31321223137. The reversal of 31321223120 is 2132212313.

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

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31321223092 and 31321223101.

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, 87320 + ... + 265079.

It is an arithmetic number, because the mean of its divisors is an integer number (1002859920).

Almost surely, 2^31321223120 is an apocalyptic number.

It is an amenable number.

31321223120 is an abundant number, since it is smaller than the sum of its proper divisors (48907570480).

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

31321223120 is a wasteful number, since it uses less digits than its factorization.

31321223120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352524 (or 352518 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31321223120 its reverse (2132212313), we get a palindrome (33453435433).

The spelling of 31321223120 in words is "thirty-one billion, three hundred twenty-one million, two hundred twenty-three thousand, one hundred twenty".