14991921 has 12 divisors (see below), whose sum is σ = 24748672. Its totient is φ = 8566776.

The previous prime is 14991917. The next prime is 14991947. The reversal of 14991921 is 12919941.

It is not a de Polignac number, because 14991921 - 2² = 14991917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (14991901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118921 + ... + 119046.

Almost surely, 2^14991921 is an apocalyptic number.

It is an amenable number.

14991921 is a deficient number, since it is larger than the sum of its proper divisors (9756751).

14991921 is a wasteful number, since it uses less digits than its factorization.

14991921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237980 (or 237977 counting only the distinct ones).

The product of its digits is 5832, while the sum is 36.

The square root of 14991921 is about 3871.9402113153. The cubic root of 14991921 is about 246.5769227541.

The spelling of 14991921 in words is "fourteen million, nine hundred ninety-one thousand, nine hundred twenty-one".