23121320000 has 140 divisors (see below), whose sum is σ = 57511399836. Its totient is φ = 9219840000.

The previous prime is 23121319997. The next prime is 23121320011. The reversal of 23121320000 is 2312132.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 18151633984 + 4969686016 = 134728^2 + 70496^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16839314 + ... + 16840686.

Almost surely, 2^23121320000 is an apocalyptic number.

23121320000 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 23121320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28755699918).

23121320000 is an abundant number, since it is smaller than the sum of its proper divisors (34390079836).

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

23121320000 is an equidigital number, since it uses as much as digits as its factorization.

23121320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826 (or 1801 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 23121320000 its reverse (2312132), we get a palindrome (23123632132).

23121320000 divided by its reverse (2312132) gives a 4-th power (10000 = 10⁴).

The spelling of 23121320000 in words is "twenty-three billion, one hundred twenty-one million, three hundred twenty thousand".