21632656117 has 4 divisors (see below), whose sum is σ = 21642302880. Its totient is φ = 21623009356.

The previous prime is 21632656099. The next prime is 21632656153. The reversal of 21632656117 is 71165623612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21632656117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21632656117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21632653117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4820017 + ... + 4824502.

It is an arithmetic number, because the mean of its divisors is an integer number (5410575720).

Almost surely, 2^21632656117 is an apocalyptic number.

It is an amenable number.

21632656117 is a deficient number, since it is larger than the sum of its proper divisors (9646763).

21632656117 is an equidigital number, since it uses as much as digits as its factorization.

21632656117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9646762.

The product of its digits is 90720, while the sum is 40.

The spelling of 21632656117 in words is "twenty-one billion, six hundred thirty-two million, six hundred fifty-six thousand, one hundred seventeen".