221437166 has 4 divisors (see below), whose sum is σ = 332155752. Its totient is φ = 110718582.

The previous prime is 221437093. The next prime is 221437213. The reversal of 221437166 is 661734122.

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

It is a super-2 number, since 2×221437166² = 98068836972223112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55359290 + ... + 55359293.

It is an arithmetic number, because the mean of its divisors is an integer number (83038938).

Almost surely, 2^221437166 is an apocalyptic number.

221437166 is a deficient number, since it is larger than the sum of its proper divisors (110718586).

221437166 is a wasteful number, since it uses less digits than its factorization.

221437166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110718585.

The product of its digits is 12096, while the sum is 32.

The square root of 221437166 is about 14880.7649668960. The cubic root of 221437166 is about 604.9927517744.

The spelling of 221437166 in words is "two hundred twenty-one million, four hundred thirty-seven thousand, one hundred sixty-six".