21222220010100 has 144 divisors (see below), whose sum is σ = 65301029841600. Its totient is φ = 5306130616320.

The previous prime is 21222220010093. The next prime is 21222220010111. The reversal of 21222220010100 is 101002222212.

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 21222220010100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18638835 + ... + 19744634.

It is an arithmetic number, because the mean of its divisors is an integer number (453479373900).

Almost surely, 2^{21222220010100} is an apocalyptic number.

21222220010100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222220010100 is an abundant number, since it is smaller than the sum of its proper divisors (44078809831500).

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

21222220010100 is a wasteful number, since it uses less digits than its factorization.

21222220010100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38383602 (or 38383595 counting only the distinct ones).

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

Adding to 21222220010100 its reverse (101002222212), we get a palindrome (21323222232312).

The spelling of 21222220010100 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty million, ten thousand, one hundred".