221421261126166 has 16 divisors (see below), whose sum is σ = 332315548905600. Its totient is φ = 110649428162560.

The previous prime is 221421261126161. The next prime is 221421261126167. The reversal of 221421261126166 is 661621162124122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421261126161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22421910 + ... + 30750358.

It is an arithmetic number, because the mean of its divisors is an integer number (20769721806600).

Almost surely, 2^{221421261126166} is an apocalyptic number.

221421261126166 is a deficient number, since it is larger than the sum of its proper divisors (110894287779434).

221421261126166 is a wasteful number, since it uses less digits than its factorization.

221421261126166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8335799.

The product of its digits is 165888, while the sum is 43.

The spelling of 221421261126166 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred sixty-one million, one hundred twenty-six thousand, one hundred sixty-six".