221092166 has 4 divisors (see below), whose sum is σ = 331638252. Its totient is φ = 110546082.

The previous prime is 221092159. The next prime is 221092171. The reversal of 221092166 is 661290122.

It is a happy number.

221092166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55273040 + ... + 55273043.

It is an arithmetic number, because the mean of its divisors is an integer number (82909563).

Almost surely, 2^221092166 is an apocalyptic number.

221092166 is a deficient number, since it is larger than the sum of its proper divisors (110546086).

221092166 is a wasteful number, since it uses less digits than its factorization.

221092166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110546085.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 221092166 is about 14869.1683022286. The cubic root of 221092166 is about 604.6783947435.

The spelling of 221092166 in words is "two hundred twenty-one million, ninety-two thousand, one hundred sixty-six".