21222121010120 has 32 divisors (see below), whose sum is σ = 48403878748920. Its totient is φ = 8372562808320.

The previous prime is 21222121010081. The next prime is 21222121010171. The reversal of 21222121010120 is 2101012122212.

It can be written as a sum of positive squares in 4 ways, for example, as 19900324716484 + 1321796293636 = 4460978^2 + 1149694^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3633921911 + ... + 3633927750.

Almost surely, 2^{21222121010120} is an apocalyptic number.

21222121010120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222121010120 is an abundant number, since it is smaller than the sum of its proper divisors (27181757738800).

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

21222121010120 is a wasteful number, since it uses less digits than its factorization.

21222121010120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7267849745 (or 7267849741 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21222121010120 its reverse (2101012122212), we get a palindrome (23323133132332).

The spelling of 21222121010120 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-one million, ten thousand, one hundred twenty".