21464700317 has 2 divisors, whose sum is σ = 21464700318. Its totient is φ = 21464700316.

The previous prime is 21464700289. The next prime is 21464700337. The reversal of 21464700317 is 71300746412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13892393956 + 7572306361 = 117866^2 + 87019^2 .

It is a cyclic number.

It is not a de Polignac number, because 21464700317 - 2¹⁰ = 21464699293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21464700337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10732350158 + 10732350159.

It is an arithmetic number, because the mean of its divisors is an integer number (10732350159).

Almost surely, 2^21464700317 is an apocalyptic number.

It is an amenable number.

21464700317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21464700317 is an equidigital number, since it uses as much as digits as its factorization.

21464700317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 35.

The spelling of 21464700317 in words is "twenty-one billion, four hundred sixty-four million, seven hundred thousand, three hundred seventeen".