22021669609 has 9 divisors (see below), whose sum is σ = 22759715901. Its totient is φ = 21306841260.

The previous prime is 22021669589. The next prime is 22021669669. The reversal of 22021669609 is 90696612022.

The square root of 22021669609 is 148397.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 22021669609 - 2⁵ = 22021669577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22021669669) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4597914 + ... + 4602700.

Almost surely, 2^22021669609 is an apocalyptic number.

22021669609 is the 148397-th square number.

22021669609 is the 74199-th centered octagonal number.

It is an amenable number.

22021669609 is a deficient number, since it is larger than the sum of its proper divisors (738046292).

22021669609 is an frugal number, since it uses more digits than its factorization.

22021669609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9636 (or 4818 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 22021669609 in words is "twenty-two billion, twenty-one million, six hundred sixty-nine thousand, six hundred nine".