13214921 has 2 divisors, whose sum is σ = 13214922. Its totient is φ = 13214920.

The previous prime is 13214917. The next prime is 13214947. The reversal of 13214921 is 12941231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7507600 + 5707321 = 2740^2 + 2389^2 .

It is a cyclic number.

It is not a de Polignac number, because 13214921 - 2² = 13214917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13214021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6607460 + 6607461.

It is an arithmetic number, because the mean of its divisors is an integer number (6607461).

Almost surely, 2^13214921 is an apocalyptic number.

It is an amenable number.

13214921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13214921 is an equidigital number, since it uses as much as digits as its factorization.

13214921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 13214921 is about 3635.2332799973. The cubic root of 13214921 is about 236.4221652216.

The spelling of 13214921 in words is "thirteen million, two hundred fourteen thousand, nine hundred twenty-one".