12921039 has 12 divisors (see below), whose sum is σ = 19355336. Its totient is φ = 8613864.

The previous prime is 12921011. The next prime is 12921049. The reversal of 12921039 is 93012921.

12921039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12921039 - 2⁸ = 12920783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12921049) 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, 26344 + ... + 26829.

Almost surely, 2^12921039 is an apocalyptic number.

12921039 is a deficient number, since it is larger than the sum of its proper divisors (6434297).

12921039 is an frugal number, since it uses more digits than its factorization.

12921039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53188 (or 53176 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 12921039 is about 3594.5846769829. The cubic root of 12921039 is about 234.6564407867.

The spelling of 12921039 in words is "twelve million, nine hundred twenty-one thousand, thirty-nine".