23121228 has 48 divisors (see below), whose sum is σ = 58509920. Its totient is φ = 7106112.

The previous prime is 23121209. The next prime is 23121247. The reversal of 23121228 is 82212132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (23121209) and next prime (23121247).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25926 + ... + 26802.

Almost surely, 2^23121228 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 23121228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29254960).

23121228 is an abundant number, since it is smaller than the sum of its proper divisors (35388692).

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

23121228 is a wasteful number, since it uses less digits than its factorization.

23121228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923 (or 895 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 23121228 is about 4808.4538055387. The cubic root of 23121228 is about 284.8854695240.

The spelling of 23121228 in words is "twenty-three million, one hundred twenty-one thousand, two hundred twenty-eight".