12721201920 has 432 divisors, whose sum is σ = 51014413632. Its totient is φ = 2866544640.

The previous prime is 12721201903. The next prime is 12721201931. The reversal of 12721201920 is 2910212721.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5885640 + ... + 5887800.

Almost surely, 2^12721201920 is an apocalyptic number.

12721201920 is a gapful number since it is divisible by the number (10) 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 12721201920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25507206816).

12721201920 is an abundant number, since it is smaller than the sum of its proper divisors (38293211712).

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

12721201920 is a wasteful number, since it uses less digits than its factorization.

12721201920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268 (or 2251 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The spelling of 12721201920 in words is "twelve billion, seven hundred twenty-one million, two hundred one thousand, nine hundred twenty".