21365512127113 has 24 divisors (see below), whose sum is σ = 27113507396064. Its totient is φ = 16648257124800.

The previous prime is 21365512127053. The next prime is 21365512127137. The reversal of 21365512127113 is 31172121556312.

It is a de Polignac number, because none of the positive numbers 2^k-21365512127113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21365512127173) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61294306 + ... + 61641892.

It is an arithmetic number, because the mean of its divisors is an integer number (1129729474836).

Almost surely, 2^{21365512127113} is an apocalyptic number.

It is an amenable number.

21365512127113 is a deficient number, since it is larger than the sum of its proper divisors (5747995268951).

21365512127113 is a wasteful number, since it uses less digits than its factorization.

21365512127113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461653 (or 461646 counting only the distinct ones).

The product of its digits is 75600, while the sum is 40.

The spelling of 21365512127113 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred twelve million, one hundred twenty-seven thousand, one hundred thirteen".