21365413895 has 24 divisors (see below), whose sum is σ = 29842835184. Its totient is φ = 14641501056.

The previous prime is 21365413879. The next prime is 21365413961. The reversal of 21365413895 is 59831456312.

It is not a de Polignac number, because 21365413895 - 2⁴ = 21365413879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 382259 + ... + 434571.

It is an arithmetic number, because the mean of its divisors is an integer number (1243451466).

Almost surely, 2^21365413895 is an apocalyptic number.

21365413895 is a deficient number, since it is larger than the sum of its proper divisors (8477421289).

21365413895 is a wasteful number, since it uses less digits than its factorization.

21365413895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53999 (or 53992 counting only the distinct ones).

The product of its digits is 777600, while the sum is 47.

The spelling of 21365413895 in words is "twenty-one billion, three hundred sixty-five million, four hundred thirteen thousand, eight hundred ninety-five".