14157205921 has 4 divisors (see below), whose sum is σ = 14486443312. Its totient is φ = 13827968532.

The previous prime is 14157205901. The next prime is 14157205963. The reversal of 14157205921 is 12950275141.

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: 12950275141 = 31 ⋅417750811.

It is a cyclic number.

It is not a de Polignac number, because 14157205921 - 2¹¹ = 14157203873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (14157205901) 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, 164618631 + ... + 164618716.

It is an arithmetic number, because the mean of its divisors is an integer number (3621610828).

Almost surely, 2^14157205921 is an apocalyptic number.

It is an amenable number.

14157205921 is a deficient number, since it is larger than the sum of its proper divisors (329237391).

14157205921 is an equidigital number, since it uses as much as digits as its factorization.

14157205921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329237390.

The product of its (nonzero) digits is 25200, while the sum is 37.

The spelling of 14157205921 in words is "fourteen billion, one hundred fifty-seven million, two hundred five thousand, nine hundred twenty-one".