13306921 has 2 divisors, whose sum is σ = 13306922. Its totient is φ = 13306920.

The previous prime is 13306907. The next prime is 13306957. The reversal of 13306921 is 12960331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12960000 + 346921 = 3600^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 13306921 - 2⁷ = 13306793 is a prime.

It is not a weakly prime, because it can be changed into another prime (13306901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6653460 + 6653461.

It is an arithmetic number, because the mean of its divisors is an integer number (6653461).

Almost surely, 2^13306921 is an apocalyptic number.

It is an amenable number.

13306921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13306921 is an equidigital number, since it uses as much as digits as its factorization.

13306921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 13306921 is about 3647.8652661522. The cubic root of 13306921 is about 236.9695403774.

The spelling of 13306921 in words is "thirteen million, three hundred six thousand, nine hundred twenty-one".