23121040 has 40 divisors (see below), whose sum is σ = 55496448. Its totient is φ = 8949120.

The previous prime is 23121031. The next prime is 23121047. The reversal of 23121040 is 4012132.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 23121040.

It is not an unprimeable number, because it can be changed into a prime (23121047) 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, 2182 + ... + 7141.

Almost surely, 2^23121040 is an apocalyptic number.

23121040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23121040 is an abundant number, since it is smaller than the sum of its proper divisors (32375408).

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

23121040 is a wasteful number, since it uses less digits than its factorization.

23121040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9367 (or 9361 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 23121040 is about 4808.4342565954. The cubic root of 23121040 is about 284.8846973820.

Adding to 23121040 its reverse (4012132), we get a palindrome (27133172).

The spelling of 23121040 in words is "twenty-three million, one hundred twenty-one thousand, forty".