111220120100 has 36 divisors (see below), whose sum is σ = 241577962500. Its totient is φ = 44445596160.

The previous prime is 111220120069. The next prime is 111220120129. The reversal of 111220120100 is 1021022111.

It can be written as a sum of positive squares in 6 ways, for example, as 1353062656 + 109867057444 = 36784^2 + 331462^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 425225 + ... + 635024.

Almost surely, 2^111220120100 is an apocalyptic number.

111220120100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111220120100 is an abundant number, since it is smaller than the sum of its proper divisors (130357842400).

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

111220120100 is a wasteful number, since it uses less digits than its factorization.

111220120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061312 (or 1061305 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 111220120100 its reverse (1021022111), we get a palindrome (112241142211).

The spelling of 111220120100 in words is "one hundred eleven billion, two hundred twenty million, one hundred twenty thousand, one hundred".