13922921 has 2 divisors, whose sum is σ = 13922922. Its totient is φ = 13922920.

The previous prime is 13922911. The next prime is 13922933. The reversal of 13922921 is 12922931.

13922921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13039321 + 883600 = 3611^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 13922921 - 2²² = 9728617 is a prime.

It is not a weakly prime, because it can be changed into another prime (13922911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6961460 + 6961461.

It is an arithmetic number, because the mean of its divisors is an integer number (6961461).

Almost surely, 2^13922921 is an apocalyptic number.

It is an amenable number.

13922921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13922921 is an equidigital number, since it uses as much as digits as its factorization.

13922921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 29.

The square root of 13922921 is about 3731.3430557910. The cubic root of 13922921 is about 240.5710994355.

The spelling of 13922921 in words is "thirteen million, nine hundred twenty-two thousand, nine hundred twenty-one".