23750021 has 4 divisors (see below), whose sum is σ = 23779500. Its totient is φ = 23720544.

The previous prime is 23750017. The next prime is 23750033. The reversal of 23750021 is 12005732.

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 12285025 + 11464996 = 3505^2 + 3386^2 .

It is a cyclic number.

It is not a de Polignac number, because 23750021 - 2² = 23750017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23749975 and 23750002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23750081) 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, 13496 + ... + 15153.

It is an arithmetic number, because the mean of its divisors is an integer number (5944875).

Almost surely, 2^23750021 is an apocalyptic number.

It is an amenable number.

23750021 is a deficient number, since it is larger than the sum of its proper divisors (29479).

23750021 is an equidigital number, since it uses as much as digits as its factorization.

23750021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29478.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 23750021 is about 4873.3993269585. The cubic root of 23750021 is about 287.4449386678. Note that the first 3 decimals are identical.

Adding to 23750021 its reverse (12005732), we get a palindrome (35755753).

The spelling of 23750021 in words is "twenty-three million, seven hundred fifty thousand, twenty-one".