21222120120120 has 96 divisors (see below), whose sum is σ = 69357208424400. Its totient is φ = 5627616193536.

The previous prime is 21222120120119. The next prime is 21222120120133. The reversal of 21222120120120 is 2102102122212.

It is a happy number.

21222120120120 is a `hidden beast` number, since 21 + 2 + 221 + 201 + 201 + 20 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 21222120120093 and 21222120120102.

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, 164601297 + ... + 164730176.

Almost surely, 2^{21222120120120} is an apocalyptic number.

21222120120120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222120120120 is an abundant number, since it is smaller than the sum of its proper divisors (48135088304280).

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

21222120120120 is a wasteful number, since it uses less digits than its factorization.

21222120120120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329331669 (or 329331662 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222120120120 its reverse (2102102122212), we get a palindrome (23324222242332).

The spelling of 21222120120120 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one hundred twenty thousand, one hundred twenty".