12921897 has 4 divisors (see below), whose sum is σ = 17229200. Its totient is φ = 8614596.

The previous prime is 12921893. The next prime is 12921901. The reversal of 12921897 is 79812921.

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 an interprime number because it is at equal distance from previous prime (12921893) and next prime (12921901).

It is not a de Polignac number, because 12921897 - 2² = 12921893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12921893) 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, 2153647 + ... + 2153652.

It is an arithmetic number, because the mean of its divisors is an integer number (4307300).

Almost surely, 2^12921897 is an apocalyptic number.

It is an amenable number.

12921897 is a deficient number, since it is larger than the sum of its proper divisors (4307303).

12921897 is an equidigital number, since it uses as much as digits as its factorization.

12921897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4307302.

The product of its digits is 18144, while the sum is 39.

The square root of 12921897 is about 3594.7040211956. The cubic root of 12921897 is about 234.6616346613.

The spelling of 12921897 in words is "twelve million, nine hundred twenty-one thousand, eight hundred ninety-seven".