12721256330 has 8 divisors (see below), whose sum is σ = 22898261412. Its totient is φ = 5088502528.

The previous prime is 12721256311. The next prime is 12721256351. The reversal of 12721256330 is 3365212721.

It can be written as a sum of positive squares in 2 ways, for example, as 10454449009 + 2266807321 = 102247^2 + 47611^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12721256330² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636062807 + ... + 636062826.

Almost surely, 2^12721256330 is an apocalyptic number.

12721256330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12721256330 is a deficient number, since it is larger than the sum of its proper divisors (10177005082).

12721256330 is a wasteful number, since it uses less digits than its factorization.

12721256330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272125640.

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 12721256330 in words is "twelve billion, seven hundred twenty-one million, two hundred fifty-six thousand, three hundred thirty".