201220111100 has 36 divisors (see below), whose sum is σ = 436782330600. Its totient is φ = 80463216960.

The previous prime is 201220111069. The next prime is 201220111177. The reversal of 201220111100 is 1111022102.

It is a super-2 number, since 2×201220111100² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 17186 + ... + 634614.

Almost surely, 2^201220111100 is an apocalyptic number.

201220111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201220111100 is an abundant number, since it is smaller than the sum of its proper divisors (235562219500).

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

201220111100 is a wasteful number, since it uses less digits than its factorization.

201220111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620702 (or 620695 counting only the distinct ones).

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

Adding to 201220111100 its reverse (1111022102), we get a palindrome (202331133202).

The spelling of 201220111100 in words is "two hundred one billion, two hundred twenty million, one hundred eleven thousand, one hundred".