21222202212012 has 12 divisors (see below), whose sum is σ = 49518471828056. Its totient is φ = 7074067404000.

The previous prime is 21222202211953. The next prime is 21222202212053. The reversal of 21222202212012 is 21021220222212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21222202212012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884258425489 + ... + 884258425512.

Almost surely, 2^{21222202212012} is an apocalyptic number.

It is an amenable number.

21222202212012 is an abundant number, since it is smaller than the sum of its proper divisors (28296269616044).

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

21222202212012 is a wasteful number, since it uses less digits than its factorization.

21222202212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768516851008 (or 1768516851006 counting only the distinct ones).

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

Adding to 21222202212012 its reverse (21021220222212), we get a palindrome (42243422434224).

The spelling of 21222202212012 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred two million, two hundred twelve thousand, twelve".