21836025317 has 4 divisors (see below), whose sum is σ = 21842791020. Its totient is φ = 21829259616.

The previous prime is 21836025293. The next prime is 21836025319. The reversal of 21836025317 is 71352063812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2267092996 + 19568932321 = 47614^2 + 139889^2 .

It is a cyclic number.

It is not a de Polignac number, because 21836025317 - 2¹⁴ = 21836008933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21836025319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3378008 + ... + 3384465.

It is an arithmetic number, because the mean of its divisors is an integer number (5460697755).

Almost surely, 2^21836025317 is an apocalyptic number.

It is an amenable number.

21836025317 is a deficient number, since it is larger than the sum of its proper divisors (6765703).

21836025317 is an equidigital number, since it uses as much as digits as its factorization.

21836025317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6765702.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 21836025317 in words is "twenty-one billion, eight hundred thirty-six million, twenty-five thousand, three hundred seventeen".