31201120220100 has 72 divisors (see below), whose sum is σ = 91755163210368. Its totient is φ = 8183900380800.

The previous prime is 31201120220093. The next prime is 31201120220191. The reversal of 31201120220100 is 102202110213.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31201120220100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 852471324 + ... + 852507923.

Almost surely, 2^{31201120220100} is an apocalyptic number.

31201120220100 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31201120220100 is an abundant number, since it is smaller than the sum of its proper divisors (60554042990268).

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

31201120220100 is a wasteful number, since it uses less digits than its factorization.

31201120220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704979325 (or 1704979318 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 31201120220100 its reverse (102202110213), we get a palindrome (31303322330313).

The spelling of 31201120220100 in words is "thirty-one trillion, two hundred one billion, one hundred twenty million, two hundred twenty thousand, one hundred".