23121532 has 54 divisors (see below), whose sum is σ = 49424928. Its totient is φ = 9435888.

The previous prime is 23121521. The next prime is 23121557. The reversal of 23121532 is 23512132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 103573 + ... + 103795.

Almost surely, 2^23121532 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 23121532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24712464).

23121532 is an abundant number, since it is smaller than the sum of its proper divisors (26303396).

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

23121532 is a wasteful number, since it uses less digits than its factorization.

23121532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 255 counting only the distinct ones).

The product of its digits is 360, while the sum is 19.

The square root of 23121532 is about 4808.4854164279. The cubic root of 23121532 is about 284.8867180852.

Adding to 23121532 its reverse (23512132), we get a palindrome (46633664).

It can be divided in two parts, 23121 and 532, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 23121532 in words is "twenty-three million, one hundred twenty-one thousand, five hundred thirty-two".