12721512 has 16 divisors (see below), whose sum is σ = 31803840. Its totient is φ = 4240496.

The previous prime is 12721477. The next prime is 12721519. The reversal of 12721512 is 21512721.

It is a super-2 number, since 2×12721512² = 323673735132288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12721519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265008 + ... + 265055.

It is an arithmetic number, because the mean of its divisors is an integer number (1987740).

Almost surely, 2^12721512 is an apocalyptic number.

12721512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12721512 is an abundant number, since it is smaller than the sum of its proper divisors (19082328).

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

12721512 is a wasteful number, since it uses less digits than its factorization.

12721512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530072 (or 530068 counting only the distinct ones).

The product of its digits is 280, while the sum is 21.

The square root of 12721512 is about 3566.7228656009. The cubic root of 12721512 is about 233.4423128115.

The spelling of 12721512 in words is "twelve million, seven hundred twenty-one thousand, five hundred twelve".