21923607 has 4 divisors (see below), whose sum is σ = 29231480. Its totient is φ = 14615736.

The previous prime is 21923599. The next prime is 21923611. The reversal of 21923607 is 70632912.

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

It is not a de Polignac number, because 21923607 - 2³ = 21923599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21921607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3653932 + ... + 3653937.

It is an arithmetic number, because the mean of its divisors is an integer number (7307870).

Almost surely, 2^21923607 is an apocalyptic number.

21923607 is a deficient number, since it is larger than the sum of its proper divisors (7307873).

21923607 is an equidigital number, since it uses as much as digits as its factorization.

21923607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7307872.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 21923607 is about 4682.2651569513. The cubic root of 21923607 is about 279.8792293788.

The spelling of 21923607 in words is "twenty-one million, nine hundred twenty-three thousand, six hundred seven".