21222131100 has 36 divisors (see below), whose sum is σ = 61402700184. Its totient is φ = 5659234880.

The previous prime is 21222131089. The next prime is 21222131153. The reversal of 21222131100 is 113122212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21222131100.

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, 35369919 + ... + 35370518.

Almost surely, 2^21222131100 is an apocalyptic number.

21222131100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222131100 is an abundant number, since it is smaller than the sum of its proper divisors (40180569084).

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

21222131100 is a wasteful number, since it uses less digits than its factorization.

21222131100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70740454 (or 70740447 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21222131100 its reverse (113122212), we get a palindrome (21335253312).

The spelling of 21222131100 in words is "twenty-one billion, two hundred twenty-two million, one hundred thirty-one thousand, one hundred".