21220120322100 has 180 divisors, whose sum is σ = 78613996583584. Its totient is φ = 4850313203520.

The previous prime is 21220120322069. The next prime is 21220120322179. The reversal of 21220120322100 is 122302102212.

21220120322100 is a `hidden beast` number, since 2 + 1 + 220 + 1 + 20 + 322 + 100 = 666.

It is a tau number, because it is divible by the number of its divisors (180).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 187069582 + ... + 187182981.

Almost surely, 2^{21220120322100} is an apocalyptic number.

21220120322100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220120322100 is an abundant number, since it is smaller than the sum of its proper divisors (57393876261484).

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

21220120322100 is a wasteful number, since it uses less digits than its factorization.

21220120322100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374252596 (or 374252580 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21220120322100 its reverse (122302102212), we get a palindrome (21342422424312).

The spelling of 21220120322100 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty million, three hundred twenty-two thousand, one hundred".