21222120201012 has 36 divisors (see below), whose sum is σ = 54136958015140. Its totient is φ = 7009140615552.

The previous prime is 21222120200993. The next prime is 21222120201031. The reversal of 21222120201012 is 21010202122212.

It is a happy number.

21222120201012 is a `hidden beast` number, since 212 + 221 + 20 + 201 + 0 + 12 = 666.

It is an interprime number because it is at equal distance from previous prime (21222120200993) and next prime (21222120201031).

It can be written as a sum of positive squares in 2 ways, for example, as 14455857951396 + 6766262249616 = 3802086^2 + 2601204^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21222120201012² (a number of 27 digits) contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 2704139833 + ... + 2704147680.

Almost surely, 2^{21222120201012} is an apocalyptic number.

It is an amenable number.

21222120201012 is an abundant number, since it is smaller than the sum of its proper divisors (32914837814128).

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

21222120201012 is a wasteful number, since it uses less digits than its factorization.

21222120201012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5408287632 (or 5408287627 counting only the distinct ones).

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

Adding to 21222120201012 its reverse (21010202122212), we get a palindrome (42232322323224).

The spelling of 21222120201012 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, two hundred one thousand, twelve".