21453306792960 has 352 divisors, whose sum is σ = 78983722298880. Its totient is φ = 4868331798528.

The previous prime is 21453306792901. The next prime is 21453306792979. The reversal of 21453306792960 is 6929760335412.

It is a self number, because there is not a number n which added to its sum of digits gives 21453306792960.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14227552 + ... + 15663008.

Almost surely, 2^{21453306792960} is an apocalyptic number.

21453306792960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21453306792960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39491861149440).

21453306792960 is an abundant number, since it is smaller than the sum of its proper divisors (57530415505920).

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

21453306792960 is a wasteful number, since it uses less digits than its factorization.

21453306792960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435631 (or 1435613 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 57.

The spelling of 21453306792960 in words is "twenty-one trillion, four hundred fifty-three billion, three hundred six million, seven hundred ninety-two thousand, nine hundred sixty".