21923242 has 8 divisors (see below), whose sum is σ = 35874432. Its totient is φ = 9965100.

The previous prime is 21923227. The next prime is 21923257. The reversal of 21923242 is 24232912.

It is an interprime number because it is at equal distance from previous prime (21923227) and next prime (21923257).

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

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, 498234 + ... + 498277.

It is an arithmetic number, because the mean of its divisors is an integer number (4484304).

Almost surely, 2^21923242 is an apocalyptic number.

21923242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21923242 is a deficient number, since it is larger than the sum of its proper divisors (13951190).

21923242 is a wasteful number, since it uses less digits than its factorization.

21923242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996524.

The product of its digits is 1728, while the sum is 25.

The square root of 21923242 is about 4682.2261799277. The cubic root of 21923242 is about 279.8776761599.

The spelling of 21923242 in words is "twenty-one million, nine hundred twenty-three thousand, two hundred forty-two".