12721356 has 36 divisors (see below), whose sum is σ = 32497192. Its totient is φ = 4195584.

The previous prime is 12721333. The next prime is 12721361. The reversal of 12721356 is 65312721.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1671 + ... + 5313.

Almost surely, 2^12721356 is an apocalyptic number.

It is an amenable number.

12721356 is an abundant number, since it is smaller than the sum of its proper divisors (19775836).

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

12721356 is a wasteful number, since it uses less digits than its factorization.

12721356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3750 (or 3745 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 12721356 is about 3566.7009967195. The cubic root of 12721356 is about 233.4413585971.

It can be divided in two parts, 1272 and 1356, that added together give a triangular number (2628 = T₇₂).

The spelling of 12721356 in words is "twelve million, seven hundred twenty-one thousand, three hundred fifty-six".