12721527738 has 48 divisors (see below), whose sum is σ = 29356760160. Its totient is φ = 4125895056.

The previous prime is 12721527713. The next prime is 12721527743. The reversal of 12721527738 is 83772512721.

It is a super-3 number, since 3×12721527738³ (a number of 31 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12721527693 and 12721527702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 335748 + ... + 371711.

It is an arithmetic number, because the mean of its divisors is an integer number (611599170).

Almost surely, 2^12721527738 is an apocalyptic number.

12721527738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12721527738 is an abundant number, since it is smaller than the sum of its proper divisors (16635232422).

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

12721527738 is an equidigital number, since it uses as much as digits as its factorization.

12721527738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707513 (or 707501 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The spelling of 12721527738 in words is "twelve billion, seven hundred twenty-one million, five hundred twenty-seven thousand, seven hundred thirty-eight".