21267195466 has 24 divisors (see below), whose sum is σ = 37127133540. Its totient is φ = 9098263680.

The previous prime is 21267195437. The next prime is 21267195473. The reversal of 21267195466 is 66459176212.

It can be written as a sum of positive squares in 2 ways, for example, as 21130983225 + 136212241 = 145365^2 + 11671^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2580621 + ... + 2588848.

Almost surely, 2^21267195466 is an apocalyptic number.

21267195466 is a deficient number, since it is larger than the sum of its proper divisors (15859938074).

21267195466 is a wasteful number, since it uses less digits than its factorization.

21267195466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5169510 (or 5169499 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 49.

The spelling of 21267195466 in words is "twenty-one billion, two hundred sixty-seven million, one hundred ninety-five thousand, four hundred sixty-six".