21722727216 has 40 divisors (see below), whose sum is σ = 57927276544. Its totient is φ = 7007330880.

The previous prime is 21722727157. The next prime is 21722727217. The reversal of 21722727216 is 61272722712.

It is a super-2 number, since 2×21722727216² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21722727217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7297816 + ... + 7300791.

Almost surely, 2^21722727216 is an apocalyptic number.

It is an amenable number.

21722727216 is an abundant number, since it is smaller than the sum of its proper divisors (36204549328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21722727216 is a wasteful number, since it uses less digits than its factorization.

21722727216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14598649 (or 14598643 counting only the distinct ones).

The product of its digits is 65856, while the sum is 39.

The spelling of 21722727216 in words is "twenty-one billion, seven hundred twenty-two million, seven hundred twenty-seven thousand, two hundred sixteen".