22021552691 has 6 divisors (see below), whose sum is σ = 23241583692. Its totient is φ = 20862523260.

The previous prime is 22021552687. The next prime is 22021552711. The reversal of 22021552691 is 19625512022.

It is not a de Polignac number, because 22021552691 - 2² = 22021552687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22021552391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30500405 + ... + 30501126.

It is an arithmetic number, because the mean of its divisors is an integer number (3873597282).

Almost surely, 2^22021552691 is an apocalyptic number.

22021552691 is a deficient number, since it is larger than the sum of its proper divisors (1220031001).

22021552691 is an equidigital number, since it uses as much as digits as its factorization.

22021552691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61001569 (or 61001550 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 22021552691 in words is "twenty-two billion, twenty-one million, five hundred fifty-two thousand, six hundred ninety-one".