220131221100 has 108 divisors (see below), whose sum is σ = 740898845064. Its totient is φ = 50315704320.

The previous prime is 220131221081. The next prime is 220131221179. The reversal of 220131221100 is 1122131022.

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 220131221100.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7472757 + ... + 7502156.

Almost surely, 2^220131221100 is an apocalyptic number.

220131221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220131221100 is an abundant number, since it is smaller than the sum of its proper divisors (520767623964).

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

220131221100 is a wasteful number, since it uses less digits than its factorization.

220131221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14974944 (or 14974930 counting only the distinct ones).

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

Adding to 220131221100 its reverse (1122131022), we get a palindrome (221253352122).

The spelling of 220131221100 in words is "two hundred twenty billion, one hundred thirty-one million, two hundred twenty-one thousand, one hundred".