21454763756317 has 8 divisors (see below), whose sum is σ = 22219890615000. Its totient is φ = 20691324058944.

The previous prime is 21454763756311. The next prime is 21454763756351. The reversal of 21454763756317 is 71365736745412.

It can be written as a sum of positive squares in 4 ways, for example, as 7173537295716 + 14281226460601 = 2678346^2 + 3779051^2 .

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 21454763756317 - 2³¹ = 21452616272669 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 (21454763756311) 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, 421764442 + ... + 421815307.

It is an arithmetic number, because the mean of its divisors is an integer number (2777486326875).

Almost surely, 2^{21454763756317} is an apocalyptic number.

It is an amenable number.

21454763756317 is a deficient number, since it is larger than the sum of its proper divisors (765126858683).

21454763756317 is an equidigital number, since it uses as much as digits as its factorization.

21454763756317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843580655.

The product of its digits is 88905600, while the sum is 61.

The spelling of 21454763756317 in words is "twenty-one trillion, four hundred fifty-four billion, seven hundred sixty-three million, seven hundred fifty-six thousand, three hundred seventeen".