22221221121012 has 12 divisors (see below), whose sum is σ = 51849515949056. Its totient is φ = 7407073707000.

The previous prime is 22221221120899. The next prime is 22221221121013. The reversal of 22221221121012 is 21012112212222.

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 22221221121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221221121013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 925884213364 + ... + 925884213387.

Almost surely, 2^{22221221121012} is an apocalyptic number.

It is an amenable number.

22221221121012 is an abundant number, since it is smaller than the sum of its proper divisors (29628294828044).

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

22221221121012 is a wasteful number, since it uses less digits than its factorization.

22221221121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851768426758 (or 1851768426756 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 22221221121012 its reverse (21012112212222), we get a palindrome (43233333333234).

The spelling of 22221221121012 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, twelve".