21222312111012 has 12 divisors (see below), whose sum is σ = 49518728259056. Its totient is φ = 7074104037000.

The previous prime is 21222312110983. The next prime is 21222312111097. The reversal of 21222312111012 is 21011121322212.

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

It is a super-2 number, since 2×21222312111012² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21222312111012.

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, 884263004614 + ... + 884263004637.

Almost surely, 2^{21222312111012} is an apocalyptic number.

It is an amenable number.

21222312111012 is an abundant number, since it is smaller than the sum of its proper divisors (28296416148044).

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

21222312111012 is a wasteful number, since it uses less digits than its factorization.

21222312111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768526009258 (or 1768526009256 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21222312111012 its reverse (21011121322212), we get a palindrome (42233433433224).

The spelling of 21222312111012 in words is "twenty-one trillion, two hundred twenty-two billion, three hundred twelve million, one hundred eleven thousand, twelve".