21679867485 has 20 divisors (see below), whose sum is σ = 38863170588. Its totient is φ = 11562595776.

The previous prime is 21679867427. The next prime is 21679867501. The reversal of 21679867485 is 58476897612.

21679867485 is a `hidden beast` number, since 2 + 1 + 6 + 7 + 98 + 67 + 485 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5953202649 + 15726664836 = 77157^2 + 125406^2 .

It is not a de Polignac number, because 21679867485 - 2⁶ = 21679867421 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26764864 + ... + 26765673.

Almost surely, 2^21679867485 is an apocalyptic number.

It is an amenable number.

21679867485 is a deficient number, since it is larger than the sum of its proper divisors (17183303103).

21679867485 is an equidigital number, since it uses as much as digits as its factorization.

21679867485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53530554 (or 53530545 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The spelling of 21679867485 in words is "twenty-one billion, six hundred seventy-nine million, eight hundred sixty-seven thousand, four hundred eighty-five".