23020521 has 16 divisors (see below), whose sum is σ = 31353600. Its totient is φ = 15020928.

The previous prime is 23020511. The next prime is 23020573. The reversal of 23020521 is 12502032.

It is not a de Polignac number, because 23020521 - 2⁵ = 23020489 is a prime.

It is a super-2 number, since 2×23020521² = 1059888774222882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23020521.

It is not an unprimeable number, because it can be changed into a prime (23020511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32115 + ... + 32823.

It is an arithmetic number, because the mean of its divisors is an integer number (1959600).

Almost surely, 2^23020521 is an apocalyptic number.

It is an amenable number.

23020521 is a deficient number, since it is larger than the sum of its proper divisors (8333079).

23020521 is a wasteful number, since it uses less digits than its factorization.

23020521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 23020521 is about 4797.9705084546. The cubic root of 23020521 is about 284.4712510962.

Adding to 23020521 its reverse (12502032), we get a palindrome (35522553).

The spelling of 23020521 in words is "twenty-three million, twenty thousand, five hundred twenty-one".