12921345 has 12 divisors (see below), whose sum is σ = 22397076. Its totient is φ = 6891360.

The previous prime is 12921329. The next prime is 12921373. The reversal of 12921345 is 54312921.

It can be written as a sum of positive squares in 2 ways, for example, as 8661249 + 4260096 = 2943^2 + 2064^2 .

It is not a de Polignac number, because 12921345 - 2⁴ = 12921329 is a prime.

It is a super-2 number, since 2×12921345² = 333922313218050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143526 + ... + 143615.

It is an arithmetic number, because the mean of its divisors is an integer number (1866423).

Almost surely, 2^12921345 is an apocalyptic number.

12921345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12921345 is a deficient number, since it is larger than the sum of its proper divisors (9475731).

12921345 is a wasteful number, since it uses less digits than its factorization.

12921345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287152 (or 287149 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 12921345 is about 3594.6272407581. The cubic root of 12921345 is about 234.6582931739.

The spelling of 12921345 in words is "twelve million, nine hundred twenty-one thousand, three hundred forty-five".