21773443579 has 16 divisors (see below), whose sum is σ = 22782735360. Its totient is φ = 20788165440.

The previous prime is 21773443577. The next prime is 21773443621. The reversal of 21773443579 is 97534437712.

It is a cyclic number.

It is not a de Polignac number, because 21773443579 - 2¹ = 21773443577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21773443577) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1689199 + ... + 1702039.

It is an arithmetic number, because the mean of its divisors is an integer number (1423920960).

Almost surely, 2^21773443579 is an apocalyptic number.

21773443579 is a deficient number, since it is larger than the sum of its proper divisors (1009291781).

21773443579 is a wasteful number, since it uses less digits than its factorization.

21773443579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13770.

The product of its digits is 4445280, while the sum is 52.

The spelling of 21773443579 in words is "twenty-one billion, seven hundred seventy-three million, four hundred forty-three thousand, five hundred seventy-nine".