21722605222 has 4 divisors (see below), whose sum is σ = 32583907836. Its totient is φ = 10861302610.

The previous prime is 21722605211. The next prime is 21722605241. The reversal of 21722605222 is 22250622712.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5430651304 + ... + 5430651307.

It is an arithmetic number, because the mean of its divisors is an integer number (8145976959).

Almost surely, 2^21722605222 is an apocalyptic number.

21722605222 is a deficient number, since it is larger than the sum of its proper divisors (10861302614).

21722605222 is a wasteful number, since it uses less digits than its factorization.

21722605222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10861302613.

The product of its (nonzero) digits is 13440, while the sum is 31.

The spelling of 21722605222 in words is "twenty-one billion, seven hundred twenty-two million, six hundred five thousand, two hundred twenty-two".