23715421 has 2 divisors, whose sum is σ = 23715422. Its totient is φ = 23715420.

The previous prime is 23715413. The next prime is 23715473. The reversal of 23715421 is 12451732.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19263321 + 4452100 = 4389^2 + 2110^2 .

It is a cyclic number.

It is not a de Polignac number, because 23715421 - 2³ = 23715413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23712421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11857710 + 11857711.

It is an arithmetic number, because the mean of its divisors is an integer number (11857711).

Almost surely, 2^23715421 is an apocalyptic number.

It is an amenable number.

23715421 is a deficient number, since it is larger than the sum of its proper divisors (1).

23715421 is an equidigital number, since it uses as much as digits as its factorization.

23715421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 25.

The square root of 23715421 is about 4869.8481495833. The cubic root of 23715421 is about 287.3052836544.

The spelling of 23715421 in words is "twenty-three million, seven hundred fifteen thousand, four hundred twenty-one".