12921007 has 16 divisors (see below), whose sum is σ = 14958720. Its totient is φ = 11037600.

The previous prime is 12921001. The next prime is 12921011. The reversal of 12921007 is 70012921.

12921007 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12921007 - 2²³ = 4532399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12921001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43953 + ... + 44245.

It is an arithmetic number, because the mean of its divisors is an integer number (934920).

Almost surely, 2^12921007 is an apocalyptic number.

12921007 is a deficient number, since it is larger than the sum of its proper divisors (2037713).

12921007 is a wasteful number, since it uses less digits than its factorization.

12921007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 12921007 is about 3594.5802258400. The cubic root of 12921007 is about 234.6562470713.

Adding to 12921007 its reverse (70012921), we get a palindrome (82933928).

The spelling of 12921007 in words is "twelve million, nine hundred twenty-one thousand, seven".