21276467717 has 8 divisors (see below), whose sum is σ = 21805217280. Its totient is φ = 20748185440.

The previous prime is 21276467669. The next prime is 21276467749. The reversal of 21276467717 is 71776467212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21276467717 - 2⁸ = 21276467461 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 (21276467777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23717 + ... + 207642.

It is an arithmetic number, because the mean of its divisors is an integer number (2725652160).

Almost surely, 2^21276467717 is an apocalyptic number.

It is an amenable number.

21276467717 is a deficient number, since it is larger than the sum of its proper divisors (528749563).

21276467717 is a wasteful number, since it uses less digits than its factorization.

21276467717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233643.

The product of its digits is 1382976, while the sum is 50.

The spelling of 21276467717 in words is "twenty-one billion, two hundred seventy-six million, four hundred sixty-seven thousand, seven hundred seventeen".