21929210393212 has 48 divisors (see below), whose sum is σ = 39665984117760. Its totient is φ = 10597002998400.

The previous prime is 21929210393203. The next prime is 21929210393213. The reversal of 21929210393212 is 21239301292912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21929210393213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1182859839 + ... + 1182878377.

It is an arithmetic number, because the mean of its divisors is an integer number (826374669120).

Almost surely, 2^{21929210393212} is an apocalyptic number.

It is an amenable number.

21929210393212 is a deficient number, since it is larger than the sum of its proper divisors (17736773724548).

21929210393212 is a wasteful number, since it uses less digits than its factorization.

21929210393212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30562 (or 30560 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 46.

The spelling of 21929210393212 in words is "twenty-one trillion, nine hundred twenty-nine billion, two hundred ten million, three hundred ninety-three thousand, two hundred twelve".