23121536 has 32 divisors (see below), whose sum is σ = 47556480. Its totient is φ = 11185920.

The previous prime is 23121521. The next prime is 23121557. The reversal of 23121536 is 63512132.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055 + ... + 6881.

It is an arithmetic number, because the mean of its divisors is an integer number (1486140).

Almost surely, 2^23121536 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 23121536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23778240).

23121536 is an abundant number, since it is smaller than the sum of its proper divisors (24434944).

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

23121536 is an equidigital number, since it uses as much as digits as its factorization.

23121536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5872 (or 5860 counting only the distinct ones).

The product of its digits is 1080, while the sum is 23.

The square root of 23121536 is about 4808.4858323593. The cubic root of 23121536 is about 284.8867345136.

Adding to 23121536 its reverse (63512132), we get a palindrome (86633668).

The spelling of 23121536 in words is "twenty-three million, one hundred twenty-one thousand, five hundred thirty-six".