23121511040000 has 110 divisors (see below), whose sum is σ = 57757066520934. Its totient is φ = 9248604160000.

The previous prime is 23121511039961. The next prime is 23121511040003. The reversal of 23121511040000 is 4011512132.

It can be written as a sum of positive squares in 5 ways, for example, as 14220501336064 + 8901009703936 = 3771008^2 + 2983456^2 .

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

It is not an unprimeable number, because it can be changed into a prime (23121511040003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 17423681 + ... + 18703680.

Almost surely, 2^{23121511040000} is an apocalyptic number.

23121511040000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23121511040000 is an abundant number, since it is smaller than the sum of its proper divisors (34635555480934).

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

23121511040000 is an frugal number, since it uses more digits than its factorization.

23121511040000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36127401 (or 36127368 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 23121511040000 its reverse (4011512132), we get a palindrome (23125522552132).

The spelling of 23121511040000 in words is "twenty-three trillion, one hundred twenty-one billion, five hundred eleven million, forty thousand".