14221665621 has 6 divisors (see below), whose sum is σ = 20542405910. Its totient is φ = 9481110408.

The previous prime is 14221665611. The next prime is 14221665629. The reversal of 14221665621 is 12656612241.

14221665621 is a `hidden beast` number, since 1 + 4 + 2 + 21 + 6 + 6 + 5 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11672425521 + 2549240100 = 108039^2 + 50490^2 .

It is not a de Polignac number, because 14221665621 - 2²¹ = 14219568469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14221665629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 790092526 + ... + 790092543.

Almost surely, 2^14221665621 is an apocalyptic number.

It is an amenable number.

14221665621 is a deficient number, since it is larger than the sum of its proper divisors (6320740289).

14221665621 is a wasteful number, since it uses less digits than its factorization.

14221665621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580185075 (or 1580185072 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The spelling of 14221665621 in words is "fourteen billion, two hundred twenty-one million, six hundred sixty-five thousand, six hundred twenty-one".