21715617747263 has 8 divisors (see below), whose sum is σ = 23690172059136. Its totient is φ = 19741131309400.

The previous prime is 21715617747247. The next prime is 21715617747323. The reversal of 21715617747263 is 36274771651712.

It is a happy number.

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 21715617747263 - 2⁴ = 21715617747247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21715617747223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16298381 + ... + 17580342.

It is an arithmetic number, because the mean of its divisors is an integer number (2961271507392).

Almost surely, 2^{21715617747263} is an apocalyptic number.

21715617747263 is a deficient number, since it is larger than the sum of its proper divisors (1974554311873).

21715617747263 is a wasteful number, since it uses less digits than its factorization.

21715617747263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33937005.

The product of its digits is 20744640, while the sum is 59.

The spelling of 21715617747263 in words is "twenty-one trillion, seven hundred fifteen billion, six hundred seventeen million, seven hundred forty-seven thousand, two hundred sixty-three".