23121034400 has 36 divisors (see below), whose sum is σ = 56444227182. Its totient is φ = 9248413440.

The previous prime is 23121034351. The next prime is 23121034423. The reversal of 23121034400 is 443012132.

It can be written as a sum of positive squares in 3 ways, for example, as 18860078224 + 4260956176 = 137332^2 + 65276^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14449847 + ... + 14451446.

Almost surely, 2^23121034400 is an apocalyptic number.

23121034400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23121034400 is an abundant number, since it is smaller than the sum of its proper divisors (33323192782).

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

23121034400 is a wasteful number, since it uses less digits than its factorization.

23121034400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28901313 (or 28901300 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 23121034400 its reverse (443012132), we get a palindrome (23564046532).

The spelling of 23121034400 in words is "twenty-three billion, one hundred twenty-one million, thirty-four thousand, four hundred".