21220122111200 has 36 divisors (see below), whose sum is σ = 51803623105920. Its totient is φ = 8488048844160.

The previous prime is 21220122111187. The next prime is 21220122111239. The reversal of 21220122111200 is 211122102212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13262575520 + ... + 13262577119.

It is an arithmetic number, because the mean of its divisors is an integer number (1438989530720).

Almost surely, 2^{21220122111200} is an apocalyptic number.

21220122111200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220122111200 is an abundant number, since it is smaller than the sum of its proper divisors (30583500994720).

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

21220122111200 is a wasteful number, since it uses less digits than its factorization.

21220122111200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26525152659 (or 26525152646 counting only the distinct ones).

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

Adding to 21220122111200 its reverse (211122102212), we get a palindrome (21431244213412).

The spelling of 21220122111200 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, one hundred eleven thousand, two hundred".