12102721720 has 32 divisors (see below), whose sum is σ = 27744923520. Its totient is φ = 4749746560.

The previous prime is 12102721691. The next prime is 12102721721. The reversal of 12102721720 is 2712720121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12102721721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2852296 + ... + 2856535.

It is an arithmetic number, because the mean of its divisors is an integer number (867028860).

Almost surely, 2^12102721720 is an apocalyptic number.

12102721720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12102721720 is an abundant number, since it is smaller than the sum of its proper divisors (15642201800).

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

12102721720 is a wasteful number, since it uses less digits than its factorization.

12102721720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5708895 (or 5708891 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 25.

It can be divided in two parts, 12102721 and 720, that added together give a square (12103441 = 3479²).

The spelling of 12102721720 in words is "twelve billion, one hundred two million, seven hundred twenty-one thousand, seven hundred twenty".