21222021112100 has 36 divisors (see below), whose sum is σ = 47122757585904. Its totient is φ = 8291394293280.

The previous prime is 21222021112073. The next prime is 21222021112147. The reversal of 21222021112100 is 121112022212.

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, 2467672574 + ... + 2467681173.

Almost surely, 2^{21222021112100} is an apocalyptic number.

21222021112100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222021112100 is an abundant number, since it is smaller than the sum of its proper divisors (25900736473804).

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

21222021112100 is a wasteful number, since it uses less digits than its factorization.

21222021112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4935353804 (or 4935353797 counting only the distinct ones).

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

Adding to 21222021112100 its reverse (121112022212), we get a palindrome (21343133134312).

The spelling of 21222021112100 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-one million, one hundred twelve thousand, one hundred".