21704700266 has 4 divisors (see below), whose sum is σ = 32557050402. Its totient is φ = 10852350132.

The previous prime is 21704700257. The next prime is 21704700271. The reversal of 21704700266 is 66200740712.

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

It can be written as a sum of positive squares in only one way, i.e., 20553523225 + 1151177041 = 143365^2 + 33929^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5426175065 + ... + 5426175068.

Almost surely, 2^21704700266 is an apocalyptic number.

21704700266 is a deficient number, since it is larger than the sum of its proper divisors (10852350136).

21704700266 is a wasteful number, since it uses less digits than its factorization.

21704700266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10852350135.

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

The spelling of 21704700266 in words is "twenty-one billion, seven hundred four million, seven hundred thousand, two hundred sixty-six".