21252817163 has 8 divisors (see below), whose sum is σ = 21555848160. Its totient is φ = 20949888960.

The previous prime is 21252817141. The next prime is 21252817181. The reversal of 21252817163 is 36171825212.

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

It is a cyclic number.

It is not a de Polignac number, because 21252817163 - 2¹⁰ = 21252816139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21252817133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454031 + ... + 498647.

It is an arithmetic number, because the mean of its divisors is an integer number (2694481020).

Almost surely, 2^21252817163 is an apocalyptic number.

21252817163 is a deficient number, since it is larger than the sum of its proper divisors (303030997).

21252817163 is an equidigital number, since it uses as much as digits as its factorization.

21252817163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51397.

The product of its digits is 40320, while the sum is 38.

The spelling of 21252817163 in words is "twenty-one billion, two hundred fifty-two million, eight hundred seventeen thousand, one hundred sixty-three".