14391205921 has 2 divisors, whose sum is σ = 14391205922. Its totient is φ = 14391205920.

The previous prime is 14391205897. The next prime is 14391205957. The reversal of 14391205921 is 12950219341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8786437696 + 5604768225 = 93736^2 + 74865^2 .

It is a cyclic number.

It is not a de Polignac number, because 14391205921 - 2⁵ = 14391205889 is a prime.

It is not a weakly prime, because it can be changed into another prime (14391205991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7195602960 + 7195602961.

It is an arithmetic number, because the mean of its divisors is an integer number (7195602961).

Almost surely, 2^14391205921 is an apocalyptic number.

It is an amenable number.

14391205921 is a deficient number, since it is larger than the sum of its proper divisors (1).

14391205921 is an equidigital number, since it uses as much as digits as its factorization.

14391205921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 14391205921 in words is "fourteen billion, three hundred ninety-one million, two hundred five thousand, nine hundred twenty-one".