21796006391 has 16 divisors (see below), whose sum is σ = 23152963680. Its totient is φ = 20447493120.

The previous prime is 21796006333. The next prime is 21796006423. The reversal of 21796006391 is 19360069712.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21796006391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21796006591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8327315 + ... + 8329931.

It is an arithmetic number, because the mean of its divisors is an integer number (1447060230).

Almost surely, 2^21796006391 is an apocalyptic number.

21796006391 is a deficient number, since it is larger than the sum of its proper divisors (1356957289).

21796006391 is a wasteful number, since it uses less digits than its factorization.

21796006391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4034.

The product of its (nonzero) digits is 122472, while the sum is 44.

The spelling of 21796006391 in words is "twenty-one billion, seven hundred ninety-six million, six thousand, three hundred ninety-one".