221142166 has 16 divisors (see below), whose sum is σ = 379320480. Its totient is φ = 94720320.

The previous prime is 221142073. The next prime is 221142169. The reversal of 221142166 is 661241122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221142166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221142169) 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, 28906 + ... + 35746.

It is an arithmetic number, because the mean of its divisors is an integer number (23707530).

Almost surely, 2^221142166 is an apocalyptic number.

221142166 is a deficient number, since it is larger than the sum of its proper divisors (158178314).

221142166 is a wasteful number, since it uses less digits than its factorization.

221142166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9159.

The product of its digits is 1152, while the sum is 25.

The square root of 221142166 is about 14870.8495386108. The cubic root of 221142166 is about 604.7239739868.

Adding to 221142166 its reverse (661241122), we get a palindrome (882383288).

The spelling of 221142166 in words is "two hundred twenty-one million, one hundred forty-two thousand, one hundred sixty-six".