21415957163 has 4 divisors (see below), whose sum is σ = 21418473720. Its totient is φ = 21413440608.

The previous prime is 21415957109. The next prime is 21415957169. The reversal of 21415957163 is 36175951412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21415957163 - 2⁶ = 21415957099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21415957169) 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, 1245470 + ... + 1262547.

It is an arithmetic number, because the mean of its divisors is an integer number (5354618430).

Almost surely, 2^21415957163 is an apocalyptic number.

21415957163 is a deficient number, since it is larger than the sum of its proper divisors (2516557).

21415957163 is an equidigital number, since it uses as much as digits as its factorization.

21415957163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2516556.

The product of its digits is 226800, while the sum is 44.

The spelling of 21415957163 in words is "twenty-one billion, four hundred fifteen million, nine hundred fifty-seven thousand, one hundred sixty-three".