23015421 has 40 divisors (see below), whose sum is σ = 40412064. Its totient is φ = 12869280.

The previous prime is 23015389. The next prime is 23015429. The reversal of 23015421 is 12451032.

23015421 is a `hidden beast` number, since 230 + 15 + 421 = 666.

It is not a de Polignac number, because 23015421 - 2⁵ = 23015389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23015394 and 23015403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23015429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10590 + ... + 12576.

Almost surely, 2^23015421 is an apocalyptic number.

It is an amenable number.

23015421 is a deficient number, since it is larger than the sum of its proper divisors (17396643).

23015421 is a wasteful number, since it uses less digits than its factorization.

23015421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023 (or 2014 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 23015421 is about 4797.4390043022. The cubic root of 23015421 is about 284.4502421518.

Adding to 23015421 its reverse (12451032), we get a palindrome (35466453).

It can be divided in two parts, 23015 and 421, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 23015421 in words is "twenty-three million, fifteen thousand, four hundred twenty-one".