21227265166 has 4 divisors (see below), whose sum is σ = 31840897752. Its totient is φ = 10613632582.

The previous prime is 21227265119. The next prime is 21227265167. The reversal of 21227265166 is 66156272212.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227265167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5306816290 + ... + 5306816293.

It is an arithmetic number, because the mean of its divisors is an integer number (7960224438).

Almost surely, 2^21227265166 is an apocalyptic number.

21227265166 is a deficient number, since it is larger than the sum of its proper divisors (10613632586).

21227265166 is a wasteful number, since it uses less digits than its factorization.

21227265166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10613632585.

The product of its digits is 120960, while the sum is 40.

The spelling of 21227265166 in words is "twenty-one billion, two hundred twenty-seven million, two hundred sixty-five thousand, one hundred sixty-six".