21611317525627 has 4 divisors (see below), whose sum is σ = 21611337627880. Its totient is φ = 21611297423376.

The previous prime is 21611317525613. The next prime is 21611317525631. The reversal of 21611317525627 is 72652571311612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21611317525627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21611317525607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8341602 + ... + 10620967.

It is an arithmetic number, because the mean of its divisors is an integer number (5402834406970).

Almost surely, 2^{21611317525627} is an apocalyptic number.

21611317525627 is a deficient number, since it is larger than the sum of its proper divisors (20102253).

21611317525627 is a wasteful number, since it uses less digits than its factorization.

21611317525627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20102252.

The product of its digits is 1058400, while the sum is 49.

The spelling of 21611317525627 in words is "twenty-one trillion, six hundred eleven billion, three hundred seventeen million, five hundred twenty-five thousand, six hundred twenty-seven".