21526360641 has 12 divisors (see below), whose sum is σ = 31136061268. Its totient is φ = 14331324384.

The previous prime is 21526360633. The next prime is 21526360663. The reversal of 21526360641 is 14606362512.

21526360641 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 6 + 3 + 6 + 0 + 641 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16898960016 + 4627400625 = 129996^2 + 68025^2 .

It is not a de Polignac number, because 21526360641 - 2³ = 21526360633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21526360596 and 21526360605.

It is not an unprimeable number, because it can be changed into a prime (21526380641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1624930 + ... + 1638123.

Almost surely, 2^21526360641 is an apocalyptic number.

It is an amenable number.

21526360641 is a deficient number, since it is larger than the sum of its proper divisors (9609700627).

21526360641 is a wasteful number, since it uses less digits than its factorization.

21526360641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263792 (or 3263789 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 21526360641 in words is "twenty-one billion, five hundred twenty-six million, three hundred sixty thousand, six hundred forty-one".