21366292557312 has 60 divisors (see below), whose sum is σ = 61664567009760. Its totient is φ = 7122097517568.

The previous prime is 21366292557287. The next prime is 21366292557341. The reversal of 21366292557312 is 21375529266312.

21366292557312 is a `hidden beast` number, since 2 + 1 + 3 + 6 + 62 + 9 + 2 + 5 + 573 + 1 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2318386512 + ... + 2318395727.

It is an arithmetic number, because the mean of its divisors is an integer number (1027742783496).

Almost surely, 2^{21366292557312} is an apocalyptic number.

It is an amenable number.

21366292557312 is an abundant number, since it is smaller than the sum of its proper divisors (40298274452448).

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

21366292557312 is an equidigital number, since it uses as much as digits as its factorization.

21366292557312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4636782263 (or 4636782244 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 54.

The spelling of 21366292557312 in words is "twenty-one trillion, three hundred sixty-six billion, two hundred ninety-two million, five hundred fifty-seven thousand, three hundred twelve".