21704659337 has 4 divisors (see below), whose sum is σ = 21733332036. Its totient is φ = 21675986640.

The previous prime is 21704659321. The next prime is 21704659351. The reversal of 21704659337 is 73395640712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12118487056 + 9586172281 = 110084^2 + 97909^2 .

It is a cyclic number.

It is not a de Polignac number, because 21704659337 - 2⁴ = 21704659321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21704659291 and 21704659300.

It is not an unprimeable number, because it can be changed into a prime (21704659037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14335214 + ... + 14336727.

It is an arithmetic number, because the mean of its divisors is an integer number (5433333009).

Almost surely, 2^21704659337 is an apocalyptic number.

It is an amenable number.

21704659337 is a deficient number, since it is larger than the sum of its proper divisors (28672699).

21704659337 is an equidigital number, since it uses as much as digits as its factorization.

21704659337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28672698.

The product of its (nonzero) digits is 952560, while the sum is 47.

The spelling of 21704659337 in words is "twenty-one billion, seven hundred four million, six hundred fifty-nine thousand, three hundred thirty-seven".