12979221 has 4 divisors (see below), whose sum is σ = 17305632. Its totient is φ = 8652812.

The previous prime is 12979159. The next prime is 12979237. The reversal of 12979221 is 12297921.

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 12979221 - 2⁷ = 12979093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12929221) 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, 2163201 + ... + 2163206.

It is an arithmetic number, because the mean of its divisors is an integer number (4326408).

Almost surely, 2^12979221 is an apocalyptic number.

It is an amenable number.

12979221 is a deficient number, since it is larger than the sum of its proper divisors (4326411).

12979221 is an equidigital number, since it uses as much as digits as its factorization.

12979221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4326410.

The product of its digits is 4536, while the sum is 33.

The square root of 12979221 is about 3602.6685942507. The cubic root of 12979221 is about 235.0081240590.

The spelling of 12979221 in words is "twelve million, nine hundred seventy-nine thousand, two hundred twenty-one".