21795985611 has 24 divisors (see below), whose sum is σ = 31616766896. Its totient is φ = 14469036480.

The previous prime is 21795985597. The next prime is 21795985613. The reversal of 21795985611 is 11658959712.

It is a happy number.

21795985611 is a `hidden beast` number, since 2 + 1 + 79 + 5 + 9 + 8 + 561 + 1 = 666.

It is not a de Polignac number, because 21795985611 - 2⁷ = 21795985483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21795985613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5654961 + ... + 5658813.

Almost surely, 2^21795985611 is an apocalyptic number.

21795985611 is a deficient number, since it is larger than the sum of its proper divisors (9820781285).

21795985611 is a wasteful number, since it uses less digits than its factorization.

21795985611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6363 (or 6360 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 54.

The spelling of 21795985611 in words is "twenty-one billion, seven hundred ninety-five million, nine hundred eighty-five thousand, six hundred eleven".