12921953 has 12 divisors (see below), whose sum is σ = 14292180. Its totient is φ = 11674080.

The previous prime is 12921943. The next prime is 12921967. The reversal of 12921953 is 35912921.

It can be written as a sum of positive squares in 2 ways, for example, as 4231249 + 8690704 = 2057^2 + 2948^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12921953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12921913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32351 + ... + 32747.

It is an arithmetic number, because the mean of its divisors is an integer number (1191015).

Almost surely, 2^12921953 is an apocalyptic number.

It is an amenable number.

12921953 is a deficient number, since it is larger than the sum of its proper divisors (1370227).

12921953 is a wasteful number, since it uses less digits than its factorization.

12921953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688 (or 677 counting only the distinct ones).

The product of its digits is 4860, while the sum is 32.

The square root of 12921953 is about 3594.7118104238. The cubic root of 12921953 is about 234.6619736475.

The spelling of 12921953 in words is "twelve million, nine hundred twenty-one thousand, nine hundred fifty-three".