23719621 has 4 divisors (see below), whose sum is σ = 23732352. Its totient is φ = 23706892.

The previous prime is 23719603. The next prime is 23719637. The reversal of 23719621 is 12691732.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23719621 - 2⁵ = 23719589 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23719691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2965 + ... + 7498.

It is an arithmetic number, because the mean of its divisors is an integer number (5933088).

Almost surely, 2^23719621 is an apocalyptic number.

It is an amenable number.

23719621 is a deficient number, since it is larger than the sum of its proper divisors (12731).

23719621 is a wasteful number, since it uses less digits than its factorization.

23719621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12730.

The product of its digits is 4536, while the sum is 31.

The square root of 23719621 is about 4870.2793554374. The cubic root of 23719621 is about 287.3222432375.

The spelling of 23719621 in words is "twenty-three million, seven hundred nineteen thousand, six hundred twenty-one".