212145166 has 4 divisors (see below), whose sum is σ = 318217752. Its totient is φ = 106072582.

The previous prime is 212145149. The next prime is 212145173. The reversal of 212145166 is 661541212.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53036290 + ... + 53036293.

It is an arithmetic number, because the mean of its divisors is an integer number (79554438).

Almost surely, 2^212145166 is an apocalyptic number.

212145166 is a deficient number, since it is larger than the sum of its proper divisors (106072586).

212145166 is a wasteful number, since it uses less digits than its factorization.

212145166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106072585.

The product of its digits is 2880, while the sum is 28.

The square root of 212145166 is about 14565.2039463922. The cubic root of 212145166 is about 596.4092631413.

Adding to 212145166 its reverse (661541212), we get a palindrome (873686378).

The spelling of 212145166 in words is "two hundred twelve million, one hundred forty-five thousand, one hundred sixty-six".