21252649492368 has 80 divisors (see below), whose sum is σ = 69717686175360. Its totient is φ = 6072185568384.

The previous prime is 21252649492357. The next prime is 21252649492387. The reversal of 21252649492368 is 86329494625212.

21252649492368 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 26 + 494 + 92 + 36 + 8 = 666.

It is a super-2 number, since 2×21252649492368² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3513993255 + ... + 3513999302.

It is an arithmetic number, because the mean of its divisors is an integer number (871471077192).

Almost surely, 2^{21252649492368} is an apocalyptic number.

21252649492368 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21252649492368 is an abundant number, since it is smaller than the sum of its proper divisors (48465036682992).

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

21252649492368 is a wasteful number, since it uses less digits than its factorization.

21252649492368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7027992581 (or 7027992569 counting only the distinct ones).

The product of its digits is 89579520, while the sum is 63.

The spelling of 21252649492368 in words is "twenty-one trillion, two hundred fifty-two billion, six hundred forty-nine million, four hundred ninety-two thousand, three hundred sixty-eight".