21611716701115 has 4 divisors (see below), whose sum is σ = 25934060041344. Its totient is φ = 17289373360888.

The previous prime is 21611716701109. The next prime is 21611716701121. The reversal of 21611716701115 is 51110761711612.

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

It is an interprime number because it is at equal distance from previous prime (21611716701109) and next prime (21611716701121).

It is a cyclic number.

It is not a de Polignac number, because 21611716701115 - 2⁵ = 21611716701083 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

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, 2161171670107 + ... + 2161171670116.

It is an arithmetic number, because the mean of its divisors is an integer number (6483515010336).

Almost surely, 2^{21611716701115} is an apocalyptic number.

21611716701115 is a deficient number, since it is larger than the sum of its proper divisors (4322343340229).

21611716701115 is an equidigital number, since it uses as much as digits as its factorization.

21611716701115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4322343340228.

The product of its (nonzero) digits is 17640, while the sum is 40.

The spelling of 21611716701115 in words is "twenty-one trillion, six hundred eleven billion, seven hundred sixteen million, seven hundred one thousand, one hundred fifteen".