23021536 has 48 divisors (see below), whose sum is σ = 48580560. Its totient is φ = 10700800.

The previous prime is 23021533. The next prime is 23021539. The reversal of 23021536 is 63512032.

It is an interprime number because it is at equal distance from previous prime (23021533) and next prime (23021539).

It is a super-2 number, since 2×23021536² = 1059982239598592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23021533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54735 + ... + 55153.

It is an arithmetic number, because the mean of its divisors is an integer number (1012095).

Almost surely, 2^23021536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23021536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24290280).

23021536 is an abundant number, since it is smaller than the sum of its proper divisors (25559024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23021536 is a wasteful number, since it uses less digits than its factorization.

23021536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 23021536 is about 4798.0762811777. The cubic root of 23021536 is about 284.4754319178.

Adding to 23021536 its reverse (63512032), we get a palindrome (86533568).

The spelling of 23021536 in words is "twenty-three million, twenty-one thousand, five hundred thirty-six".