21221122211012 has 12 divisors (see below), whose sum is σ = 37140467100156. Its totient is φ = 10609560182400.

The previous prime is 21221122210991. The next prime is 21221122211033. The reversal of 21221122211012 is 21011222112212.

It is an interprime number because it is at equal distance from previous prime (21221122210991) and next prime (21221122211033).

It can be written as a sum of positive squares in 2 ways, for example, as 19011570771076 + 2209551439936 = 4360226^2 + 1486456^2 .

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, 250183073 + ... + 250267880.

It is an arithmetic number, because the mean of its divisors is an integer number (3095038925013).

Almost surely, 2^{21221122211012} is an apocalyptic number.

It is an amenable number.

21221122211012 is a deficient number, since it is larger than the sum of its proper divisors (15919344889144).

21221122211012 is a wasteful number, since it uses less digits than its factorization.

21221122211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500461558 (or 500461556 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21221122211012 its reverse (21011222112212), we get a palindrome (42232344323224).

The spelling of 21221122211012 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, twelve".