21722517345 has 8 divisors (see below), whose sum is σ = 34756027776. Its totient is φ = 11585342576.

The previous prime is 21722517319. The next prime is 21722517361. The reversal of 21722517345 is 54371522712.

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

It is a cyclic number.

It is not a de Polignac number, because 21722517345 - 2⁹ = 21722516833 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724083897 + ... + 724083926.

It is an arithmetic number, because the mean of its divisors is an integer number (4344503472).

Almost surely, 2^21722517345 is an apocalyptic number.

It is an amenable number.

21722517345 is a deficient number, since it is larger than the sum of its proper divisors (13033510431).

21722517345 is a wasteful number, since it uses less digits than its factorization.

21722517345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448167831.

The product of its digits is 117600, while the sum is 39.

The spelling of 21722517345 in words is "twenty-one billion, seven hundred twenty-two million, five hundred seventeen thousand, three hundred forty-five".