21222122111100 has 108 divisors (see below), whose sum is σ = 66943254678664. Its totient is φ = 5623186458240.

The previous prime is 21222122111089. The next prime is 21222122111101. The reversal of 21222122111100 is 111122122212.

21222122111100 is a `hidden beast` number, since 212 + 221 + 22 + 111 + 100 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222122111101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 74954674 + ... + 75237273.

Almost surely, 2^{21222122111100} is an apocalyptic number.

21222122111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222122111100 is an abundant number, since it is smaller than the sum of its proper divisors (45721132567564).

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

21222122111100 is a wasteful number, since it uses less digits than its factorization.

21222122111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150192124 (or 150192114 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21222122111100 its reverse (111122122212), we get a palindrome (21333244233312).

The spelling of 21222122111100 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, one hundred eleven thousand, one hundred".