23121444 has 24 divisors (see below), whose sum is σ = 55205920. Its totient is φ = 7527744.

The previous prime is 23121437. The next prime is 23121457. The reversal of 23121444 is 44412132.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 23121444.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21889 + ... + 22920.

Almost surely, 2^23121444 is an apocalyptic number.

It is an amenable number.

23121444 is an abundant number, since it is smaller than the sum of its proper divisors (32084476).

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

23121444 is a wasteful number, since it uses less digits than its factorization.

23121444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44859 (or 44857 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 23121444 is about 4808.4762659287. The cubic root of 23121444 is about 284.8863566607.

Adding to 23121444 its reverse (44412132), we get a palindrome (67533576).

The spelling of 23121444 in words is "twenty-three million, one hundred twenty-one thousand, four hundred forty-four".