21304526266 has 4 divisors (see below), whose sum is σ = 31956789402. Its totient is φ = 10652263132.

The previous prime is 21304526233. The next prime is 21304526311. The reversal of 21304526266 is 66262540312.

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., 19160373241 + 2144153025 = 138421^2 + 46305^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5326131565 + ... + 5326131568.

Almost surely, 2^21304526266 is an apocalyptic number.

21304526266 is a deficient number, since it is larger than the sum of its proper divisors (10652263136).

21304526266 is a wasteful number, since it uses less digits than its factorization.

21304526266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10652263135.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 21304526266 in words is "twenty-one billion, three hundred four million, five hundred twenty-six thousand, two hundred sixty-six".