21716735051885 has 4 divisors (see below), whose sum is σ = 26060082062268. Its totient is φ = 17373388041504.

The previous prime is 21716735051881. The next prime is 21716735051899. The reversal of 21716735051885 is 58815053761712.

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 3171636866281 + 18545098185604 = 1780909^2 + 4306402^2 .

It is a cyclic number.

It is not a de Polignac number, because 21716735051885 - 2² = 21716735051881 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 (21716735051881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2171673505184 + ... + 2171673505193.

It is an arithmetic number, because the mean of its divisors is an integer number (6515020515567).

Almost surely, 2^{21716735051885} is an apocalyptic number.

It is an amenable number.

21716735051885 is a deficient number, since it is larger than the sum of its proper divisors (4343347010383).

21716735051885 is an equidigital number, since it uses as much as digits as its factorization.

21716735051885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4343347010382.

The product of its (nonzero) digits is 14112000, while the sum is 59.

The spelling of 21716735051885 in words is "twenty-one trillion, seven hundred sixteen billion, seven hundred thirty-five million, fifty-one thousand, eight hundred eighty-five".