21365265352451 has 8 divisors (see below), whose sum is σ = 22503228022800. Its totient is φ = 20228650184160.

The previous prime is 21365265352439. The next prime is 21365265352511. The reversal of 21365265352451 is 15425356256312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21365265352451 - 2²² = 21365261158147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21365265352451.

It is not an unprimeable number, because it can be changed into a prime (21365262352451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336842960 + ... + 336906381.

It is an arithmetic number, because the mean of its divisors is an integer number (2812903502850).

Almost surely, 2^{21365265352451} is an apocalyptic number.

21365265352451 is a deficient number, since it is larger than the sum of its proper divisors (1137962670349).

21365265352451 is a wasteful number, since it uses less digits than its factorization.

21365265352451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673751029.

The product of its digits is 6480000, while the sum is 50.

The spelling of 21365265352451 in words is "twenty-one trillion, three hundred sixty-five billion, two hundred sixty-five million, three hundred fifty-two thousand, four hundred fifty-one".