21920163 has 8 divisors (see below), whose sum is σ = 29251776. Its totient is φ = 14601000.

The previous prime is 21920141. The next prime is 21920177. The reversal of 21920163 is 36102912.

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

It is not a de Polignac number, because 21920163 - 2¹³ = 21911971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21920113) 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, 2388 + ... + 7038.

It is an arithmetic number, because the mean of its divisors is an integer number (3656472).

Almost surely, 2^21920163 is an apocalyptic number.

21920163 is a deficient number, since it is larger than the sum of its proper divisors (7331613).

21920163 is a wasteful number, since it uses less digits than its factorization.

21920163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6225.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 21920163 is about 4681.8973717928. The cubic root of 21920163 is about 279.8645731144.

The spelling of 21920163 in words is "twenty-one million, nine hundred twenty thousand, one hundred sixty-three".