21251313814459 has 8 divisors (see below), whose sum is σ = 22377472844240. Its totient is φ = 20125921667616.

The previous prime is 21251313814447. The next prime is 21251313814463. The reversal of 21251313814459 is 95441831315212.

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 21251313814459 - 2⁵ = 21251313814427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21251313814469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191663844 + ... + 191774689.

It is an arithmetic number, because the mean of its divisors is an integer number (2797184105530).

Almost surely, 2^{21251313814459} is an apocalyptic number.

21251313814459 is a deficient number, since it is larger than the sum of its proper divisors (1126159029781).

21251313814459 is a wasteful number, since it uses less digits than its factorization.

21251313814459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383441469.

The product of its digits is 1036800, while the sum is 49.

The spelling of 21251313814459 in words is "twenty-one trillion, two hundred fifty-one billion, three hundred thirteen million, eight hundred fourteen thousand, four hundred fifty-nine".