21923995 has 4 divisors (see below), whose sum is σ = 26308800. Its totient is φ = 17539192.

The previous prime is 21923981. The next prime is 21924031. The reversal of 21923995 is 59932912.

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 21923995 - 2¹⁵ = 21891227 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2192395 + ... + 2192404.

It is an arithmetic number, because the mean of its divisors is an integer number (6577200).

Almost surely, 2^21923995 is an apocalyptic number.

21923995 is a deficient number, since it is larger than the sum of its proper divisors (4384805).

21923995 is an equidigital number, since it uses as much as digits as its factorization.

21923995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384804.

The product of its digits is 43740, while the sum is 40.

The square root of 21923995 is about 4682.3065897055. The cubic root of 21923995 is about 279.8808804530.

The spelling of 21923995 in words is "twenty-one million, nine hundred twenty-three thousand, nine hundred ninety-five".