23121100 has 72 divisors (see below), whose sum is σ = 54232640. Its totient is φ = 8527680.

The previous prime is 23121073. The next prime is 23121101. The reversal of 23121100 is 112132.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (23121101) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 81559 + ... + 81841.

Almost surely, 2^23121100 is an apocalyptic number.

23121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27116320).

23121100 is an abundant number, since it is smaller than the sum of its proper divisors (31111540).

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

23121100 is a wasteful number, since it uses less digits than its factorization.

23121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 23121100 is about 4808.4404956285. The cubic root of 23121100 is about 284.8849438108.

Adding to 23121100 its reverse (112132), we get a palindrome (23233232).

The spelling of 23121100 in words is "twenty-three million, one hundred twenty-one thousand, one hundred".