21778889361722 has 8 divisors (see below), whose sum is σ = 32671975618272. Its totient is φ = 10888230822300.

The previous prime is 21778889361721. The next prime is 21778889361727. The reversal of 21778889361722 is 22716398887712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21778889361721) 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, 606906854 + ... + 606942737.

It is an arithmetic number, because the mean of its divisors is an integer number (4083996952284).

Almost surely, 2^{21778889361722} is an apocalyptic number.

21778889361722 is a deficient number, since it is larger than the sum of its proper divisors (10893086256550).

21778889361722 is a wasteful number, since it uses less digits than its factorization.

21778889361722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213858564.

The product of its digits is 227598336, while the sum is 71.

The spelling of 21778889361722 in words is "twenty-one trillion, seven hundred seventy-eight billion, eight hundred eighty-nine million, three hundred sixty-one thousand, seven hundred twenty-two".