21716340677 has 4 divisors (see below), whose sum is σ = 21927179040. Its totient is φ = 21505502316.

The previous prime is 21716340641. The next prime is 21716340749. The reversal of 21716340677 is 77604361712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21716340677 - 2¹⁸ = 21716078533 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 (21716330677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105419027 + ... + 105419232.

It is an arithmetic number, because the mean of its divisors is an integer number (5481794760).

Almost surely, 2^21716340677 is an apocalyptic number.

It is an amenable number.

21716340677 is a deficient number, since it is larger than the sum of its proper divisors (210838363).

21716340677 is a wasteful number, since it uses less digits than its factorization.

21716340677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210838362.

The product of its (nonzero) digits is 296352, while the sum is 44.

The spelling of 21716340677 in words is "twenty-one billion, seven hundred sixteen million, three hundred forty thousand, six hundred seventy-seven".