12721355 has 16 divisors (see below), whose sum is σ = 17016480. Its totient is φ = 9073152.

The previous prime is 12721333. The next prime is 12721361. The reversal of 12721355 is 55312721.

It is a cyclic number.

It is not a de Polignac number, because 12721355 - 2⁸ = 12721099 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2324 + ... + 5553.

It is an arithmetic number, because the mean of its divisors is an integer number (1063530).

Almost surely, 2^12721355 is an apocalyptic number.

12721355 is a deficient number, since it is larger than the sum of its proper divisors (4295125).

12721355 is a wasteful number, since it uses less digits than its factorization.

12721355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7918.

The product of its digits is 2100, while the sum is 26.

The square root of 12721355 is about 3566.7008565339. The cubic root of 12721355 is about 233.4413524803.

The spelling of 12721355 in words is "twelve million, seven hundred twenty-one thousand, three hundred fifty-five".