21220111122200 has 96 divisors (see below), whose sum is σ = 51937183099200. Its totient is φ = 8040724122240.

The previous prime is 21220111122167. The next prime is 21220111122211. The reversal of 21220111122200 is 222111102212.

It is a super-2 number, since 2×21220111122200² (a number of 27 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 23 ways as a sum of consecutive naturals, for example, 54323987 + ... + 54713213.

It is an arithmetic number, because the mean of its divisors is an integer number (541012323950).

Almost surely, 2^{21220111122200} is an apocalyptic number.

21220111122200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220111122200 is an abundant number, since it is smaller than the sum of its proper divisors (30717071977000).

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

21220111122200 is a wasteful number, since it uses less digits than its factorization.

21220111122200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403609 (or 403600 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220111122200 its reverse (222111102212), we get a palindrome (21442222224412).

The spelling of 21220111122200 in words is "twenty-one trillion, two hundred twenty billion, one hundred eleven million, one hundred twenty-two thousand, two hundred".