12115720001 has 16 divisors (see below), whose sum is σ = 15110997120. Its totient is φ = 9437268480.

The previous prime is 12115719997. The next prime is 12115720003. The reversal of 12115720001 is 10002751121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12115720001 - 2² = 12115719997 is a prime.

It is a super-2 number, since 2×12115720001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12115720003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186545 + ... + 242961.

It is an arithmetic number, because the mean of its divisors is an integer number (944437320).

Almost surely, 2^12115720001 is an apocalyptic number.

12115720001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12115720001 is a deficient number, since it is larger than the sum of its proper divisors (2995277119).

12115720001 is a wasteful number, since it uses less digits than its factorization.

12115720001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59224.

The product of its (nonzero) digits is 140, while the sum is 20.

The spelling of 12115720001 in words is "twelve billion, one hundred fifteen million, seven hundred twenty thousand, one".