21210643331795 has 8 divisors (see below), whose sum is σ = 25487496111696. Its totient is φ = 16945365256416.

The previous prime is 21210643331711. The next prime is 21210643331803. The reversal of 21210643331795 is 59713334601212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210643331795 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2893672097 + ... + 2893679426.

It is an arithmetic number, because the mean of its divisors is an integer number (3185937013962).

Almost surely, 2^{21210643331795} is an apocalyptic number.

21210643331795 is a deficient number, since it is larger than the sum of its proper divisors (4276852779901).

21210643331795 is an equidigital number, since it uses as much as digits as its factorization.

21210643331795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5787352261.

The product of its (nonzero) digits is 816480, while the sum is 47.

The spelling of 21210643331795 in words is "twenty-one trillion, two hundred ten billion, six hundred forty-three million, three hundred thirty-one thousand, seven hundred ninety-five".