13308921 has 16 divisors (see below), whose sum is σ = 19824000. Its totient is φ = 8824464.

The previous prime is 13308917. The next prime is 13308923. The reversal of 13308921 is 12980331.

It is not a de Polignac number, because 13308921 - 2² = 13308917 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (13308923) 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, 4135 + ... + 6611.

It is an arithmetic number, because the mean of its divisors is an integer number (1239000).

Almost surely, 2^13308921 is an apocalyptic number.

It is an amenable number.

13308921 is a deficient number, since it is larger than the sum of its proper divisors (6515079).

13308921 is a wasteful number, since it uses less digits than its factorization.

13308921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2685 (or 2679 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 13308921 is about 3648.1393887844. The cubic root of 13308921 is about 236.9814117772.

The spelling of 13308921 in words is "thirteen million, three hundred eight thousand, nine hundred twenty-one".