21172233466 has 16 divisors (see below), whose sum is σ = 33934994280. Its totient is φ = 9871994880.

The previous prime is 21172233443. The next prime is 21172233479. The reversal of 21172233466 is 66433227112.

It can be written as a sum of positive squares in 4 ways, for example, as 16135350625 + 5036882841 = 127025^2 + 70971^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2852775 + ... + 2860186.

Almost surely, 2^21172233466 is an apocalyptic number.

21172233466 is a deficient number, since it is larger than the sum of its proper divisors (12762760814).

21172233466 is a wasteful number, since it uses less digits than its factorization.

21172233466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5713089.

The product of its digits is 72576, while the sum is 37.

The spelling of 21172233466 in words is "twenty-one billion, one hundred seventy-two million, two hundred thirty-three thousand, four hundred sixty-six".