21222120122100 has 108 divisors (see below), whose sum is σ = 66695070929760. Its totient is φ = 5644299931200.

The previous prime is 21222120122083. The next prime is 21222120122129. The reversal of 21222120122100 is 122102122212.

It is a happy number.

21222120122100 is a `hidden beast` number, since 21 + 2 + 221 + 201 + 221 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 30767256 + ... + 31449455.

Almost surely, 2^{21222120122100} is an apocalyptic number.

21222120122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222120122100 is an abundant number, since it is smaller than the sum of its proper divisors (45472950807660).

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

21222120122100 is a wasteful number, since it uses less digits than its factorization.

21222120122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62217110 (or 62217100 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222120122100 its reverse (122102122212), we get a palindrome (21344222244312).

The spelling of 21222120122100 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one hundred twenty-two thousand, one hundred".