23621 has 8 divisors (see below), whose sum is σ = 26880. Its totient is φ = 20592.

The previous prime is 23609. The next prime is 23623. The reversal of 23621 is 12632.

23621 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.

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

It is not a de Polignac number, because 23621 - 2⁶ = 23557 is a prime.

It is a Duffinian number.

23621 is a modest number, since divided by 621 gives 23 as remainder.

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 23596 and 23605.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 23621.

It is not an unprimeable number, because it can be changed into a prime (23623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260 + ... + 338.

It is an arithmetic number, because the mean of its divisors is an integer number (3360).

2²³⁶²¹ is an apocalyptic number.

It is an amenable number.

23621 is a deficient number, since it is larger than the sum of its proper divisors (3259).

23621 is a wasteful number, since it uses less digits than its factorization.

23621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115.

The product of its digits is 72, while the sum is 14.

The square root of 23621 is about 153.6912489376. The cubic root of 23621 is about 28.6923482375.

The spelling of 23621 in words is "twenty-three thousand, six hundred twenty-one".