23021553 has 16 divisors (see below), whose sum is σ = 32598720. Its totient is φ = 14401536.

The previous prime is 23021539. The next prime is 23021567. The reversal of 23021553 is 35512032.

It is an interprime number because it is at equal distance from previous prime (23021539) and next prime (23021567).

It is not a de Polignac number, because 23021553 - 2¹⁷ = 22890481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23021503) 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, 29553 + ... + 30321.

It is an arithmetic number, because the mean of its divisors is an integer number (2037420).

Almost surely, 2^23021553 is an apocalyptic number.

It is an amenable number.

23021553 is a deficient number, since it is larger than the sum of its proper divisors (9577167).

23021553 is a wasteful number, since it uses less digits than its factorization.

23021553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 23021553 is about 4798.0780527207. The cubic root of 23021553 is about 284.4755019404.

Adding to 23021553 its reverse (35512032), we get a palindrome (58533585).

The spelling of 23021553 in words is "twenty-three million, twenty-one thousand, five hundred fifty-three".