31123202100320 has 96 divisors (see below), whose sum is σ = 80215138182816. Its totient is φ = 11317223526400.

The previous prime is 31123202100313. The next prime is 31123202100383. The reversal of 31123202100320 is 2300120232113.

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 = 31123202100292 and 31123202100301.

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, 71303540 + ... + 71738700.

It is an arithmetic number, because the mean of its divisors is an integer number (835574356071).

Almost surely, 2^{31123202100320} is an apocalyptic number.

It is an amenable number.

31123202100320 is an abundant number, since it is smaller than the sum of its proper divisors (49091936082496).

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

31123202100320 is a wasteful number, since it uses less digits than its factorization.

31123202100320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475824 (or 475816 counting only the distinct ones).

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

Adding to 31123202100320 its reverse (2300120232113), we get a palindrome (33423322332433).

The spelling of 31123202100320 in words is "thirty-one trillion, one hundred twenty-three billion, two hundred two million, one hundred thousand, three hundred twenty".