21222201222012 has 72 divisors (see below), whose sum is σ = 57766299803856. Its totient is φ = 6046308989952.

The previous prime is 21222201221959. The next prime is 21222201222041. The reversal of 21222201222012 is 21022210222212.

It is a super-2 number, since 2×21222201222012² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21222201222012.

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, 50914503 + ... + 51329630.

It is an arithmetic number, because the mean of its divisors is an integer number (802309719498).

Almost surely, 2^{21222201222012} is an apocalyptic number.

It is an amenable number.

21222201222012 is an abundant number, since it is smaller than the sum of its proper divisors (36544098581844).

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

21222201222012 is a wasteful number, since it uses less digits than its factorization.

21222201222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102244507 (or 102244498 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21222201222012 its reverse (21022210222212), we get a palindrome (42244411444224).

The spelling of 21222201222012 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred one million, two hundred twenty-two thousand, twelve".