21722212775 has 12 divisors (see below), whose sum is σ = 26937753552. Its totient is φ = 17376344640.

The previous prime is 21722212727. The next prime is 21722212817. The reversal of 21722212775 is 57721222712.

It is a de Polignac number, because none of the positive numbers 2^k-21722212775 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 362339 + ... + 418011.

It is an arithmetic number, because the mean of its divisors is an integer number (2244812796).

Almost surely, 2^21722212775 is an apocalyptic number.

21722212775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21722212775 is a deficient number, since it is larger than the sum of its proper divisors (5215540777).

21722212775 is a wasteful number, since it uses less digits than its factorization.

21722212775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71290 (or 71285 counting only the distinct ones).

The product of its digits is 54880, while the sum is 38.

The spelling of 21722212775 in words is "twenty-one billion, seven hundred twenty-two million, two hundred twelve thousand, seven hundred seventy-five".