13279921 has 4 divisors (see below), whose sum is σ = 13375600. Its totient is φ = 13184244.

The previous prime is 13279913. The next prime is 13279943. The reversal of 13279921 is 12997231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13279921 - 2³ = 13279913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13279951) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 47631 + ... + 47908.

It is an arithmetic number, because the mean of its divisors is an integer number (3343900).

Almost surely, 2^13279921 is an apocalyptic number.

It is an amenable number.

13279921 is a deficient number, since it is larger than the sum of its proper divisors (95679).

13279921 is an equidigital number, since it uses as much as digits as its factorization.

13279921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95678.

The product of its digits is 6804, while the sum is 34.

The square root of 13279921 is about 3644.1625924209. The cubic root of 13279921 is about 236.8091599303.

The spelling of 13279921 in words is "thirteen million, two hundred seventy-nine thousand, nine hundred twenty-one".