21220122202100 has 72 divisors (see below), whose sum is σ = 46295322826368. Its totient is φ = 8442414950400.

The previous prime is 21220122202039. The next prime is 21220122202159. The reversal of 21220122202100 is 120222102212.

It is a happy number.

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, 100853207 + ... + 101063393.

Almost surely, 2^{21220122202100} is an apocalyptic number.

21220122202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220122202100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23147661413184).

21220122202100 is an abundant number, since it is smaller than the sum of its proper divisors (25075200624268).

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

21220122202100 is a wasteful number, since it uses less digits than its factorization.

21220122202100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215625 (or 215618 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21220122202100 its reverse (120222102212), we get a palindrome (21340344304312).

The spelling of 21220122202100 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, two hundred two thousand, one hundred".