12921311 has 8 divisors (see below), whose sum is σ = 14647920. Its totient is φ = 11299392.

The previous prime is 12921299. The next prime is 12921329. The reversal of 12921311 is 11312921.

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

It is a de Polignac number, because none of the positive numbers 2^k-12921311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12921011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25910 + ... + 26403.

It is an arithmetic number, because the mean of its divisors is an integer number (1830990).

Almost surely, 2^12921311 is an apocalyptic number.

12921311 is a deficient number, since it is larger than the sum of its proper divisors (1726609).

12921311 is a wasteful number, since it uses less digits than its factorization.

12921311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52345.

The product of its digits is 108, while the sum is 20.

The square root of 12921311 is about 3594.6225114746. The cubic root of 12921311 is about 234.6580873546.

The spelling of 12921311 in words is "twelve million, nine hundred twenty-one thousand, three hundred eleven".