21222002210100 has 72 divisors (see below), whose sum is σ = 63061848762528. Its totient is φ = 5506249219200.

The previous prime is 21222002210093. The next prime is 21222002210159. The reversal of 21222002210100 is 101220022212.

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 21222002210100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 955934946 + ... + 955957145.

Almost surely, 2^{21222002210100} is an apocalyptic number.

21222002210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222002210100 is an abundant number, since it is smaller than the sum of its proper divisors (41839846552428).

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

21222002210100 is a wasteful number, since it uses less digits than its factorization.

21222002210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911892145 (or 1911892138 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21222002210100 its reverse (101220022212), we get a palindrome (21323222232312).

The spelling of 21222002210100 in words is "twenty-one trillion, two hundred twenty-two billion, two million, two hundred ten thousand, one hundred".