21611716677325 has 6 divisors (see below), whose sum is σ = 26798528679914. Its totient is φ = 17289373341840.

The previous prime is 21611716677307. The next prime is 21611716677359. The reversal of 21611716677325 is 52377661711612.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6566995369 + 21605149681956 = 81037^2 + 4648134^2 .

It is not a de Polignac number, because 21611716677325 - 2⁷ = 21611716677197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 432234333522 + ... + 432234333571.

Almost surely, 2^{21611716677325} is an apocalyptic number.

21611716677325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21611716677325 is a deficient number, since it is larger than the sum of its proper divisors (5186812002589).

21611716677325 is an equidigital number, since it uses as much as digits as its factorization.

21611716677325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864468667103 (or 864468667098 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 55.

The spelling of 21611716677325 in words is "twenty-one trillion, six hundred eleven billion, seven hundred sixteen million, six hundred seventy-seven thousand, three hundred twenty-five".