23980021 has 4 divisors (see below), whose sum is σ = 25824652. Its totient is φ = 22135392.

The previous prime is 23980003. The next prime is 23980027. The reversal of 23980021 is 12008932.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8059921 + 15920100 = 2839^2 + 3990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23980021 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 (23980027) 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, 922296 + ... + 922321.

It is an arithmetic number, because the mean of its divisors is an integer number (6456163).

Almost surely, 2^23980021 is an apocalyptic number.

It is an amenable number.

23980021 is a deficient number, since it is larger than the sum of its proper divisors (1844631).

23980021 is a wasteful number, since it uses less digits than its factorization.

23980021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844630.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 23980021 is about 4896.9399628748. The cubic root of 23980021 is about 288.3698509961.

Adding to 23980021 its reverse (12008932), we get a palindrome (35988953).

The spelling of 23980021 in words is "twenty-three million, nine hundred eighty thousand, twenty-one".