21151422213212 has 12 divisors (see below), whose sum is σ = 37015229060880. Its totient is φ = 10575642481536.

The previous prime is 21151422213193. The next prime is 21151422213223. The reversal of 21151422213212 is 21231222415112.

It is a happy number.

It is a congruent number.

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, 16459637 + ... + 17698092.

It is an arithmetic number, because the mean of its divisors is an integer number (3084602421740).

Almost surely, 2^{21151422213212} is an apocalyptic number.

It is an amenable number.

21151422213212 is a deficient number, since it is larger than the sum of its proper divisors (15863806847668).

21151422213212 is a wasteful number, since it uses less digits than its factorization.

21151422213212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34312540 (or 34312538 counting only the distinct ones).

The product of its digits is 3840, while the sum is 29.

Adding to 21151422213212 its reverse (21231222415112), we get a palindrome (42382644628324).

The spelling of 21151422213212 in words is "twenty-one trillion, one hundred fifty-one billion, four hundred twenty-two million, two hundred thirteen thousand, two hundred twelve".