14909515921 has 4 divisors (see below), whose sum is σ = 15226739712. Its totient is φ = 14592292132.

The previous prime is 14909515891. The next prime is 14909515961. The reversal of 14909515921 is 12951590941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12951590941 = 1901 ⋅6813041.

It is a cyclic number.

It is not a de Polignac number, because 14909515921 - 2⁷ = 14909515793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (14909515961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158611825 + ... + 158611918.

It is an arithmetic number, because the mean of its divisors is an integer number (3806684928).

Almost surely, 2^14909515921 is an apocalyptic number.

It is an amenable number.

14909515921 is a deficient number, since it is larger than the sum of its proper divisors (317223791).

14909515921 is an equidigital number, since it uses as much as digits as its factorization.

14909515921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317223790.

The product of its (nonzero) digits is 145800, while the sum is 46.

The spelling of 14909515921 in words is "fourteen billion, nine hundred nine million, five hundred fifteen thousand, nine hundred twenty-one".