14388641821 has 2 divisors, whose sum is σ = 14388641822. Its totient is φ = 14388641820.

The previous prime is 14388641797. The next prime is 14388641831. The reversal of 14388641821 is 12814688341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13983062500 + 405579321 = 118250^2 + 20139^2 .

It is a cyclic number.

It is not a de Polignac number, because 14388641821 - 2⁷ = 14388641693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (14388641831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7194320910 + 7194320911.

It is an arithmetic number, because the mean of its divisors is an integer number (7194320911).

Almost surely, 2^14388641821 is an apocalyptic number.

It is an amenable number.

14388641821 is a deficient number, since it is larger than the sum of its proper divisors (1).

14388641821 is an equidigital number, since it uses as much as digits as its factorization.

14388641821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294912, while the sum is 46.

The spelling of 14388641821 in words is "fourteen billion, three hundred eighty-eight million, six hundred forty-one thousand, eight hundred twenty-one".