23121800 has 48 divisors (see below), whose sum is σ = 57899940. Its totient is φ = 8536320.

The previous prime is 23121797. The next prime is 23121817. The reversal of 23121800 is 812132.

It can be written as a sum of positive squares in 6 ways, for example, as 1350244 + 21771556 = 1162^2 + 4666^2 .

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 11 ways as a sum of consecutive naturals, for example, 1847 + ... + 7046.

Almost surely, 2^23121800 is an apocalyptic number.

23121800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23121800 is an abundant number, since it is smaller than the sum of its proper divisors (34778140).

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

23121800 is a wasteful number, since it uses less digits than its factorization.

23121800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8922 (or 8913 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 23121800 is about 4808.5132837500. The cubic root of 23121800 is about 284.8878187814.

Adding to 23121800 its reverse (812132), we get a palindrome (23933932).

It can be divided in two parts, 2312 and 1800, that multiplied together give a square (4161600 = 2040²).

The spelling of 23121800 in words is "twenty-three million, one hundred twenty-one thousand, eight hundred".