211215166 has 8 divisors (see below), whose sum is σ = 325385640. Its totient is φ = 102753288.

The previous prime is 211215161. The next prime is 211215197. The reversal of 211215166 is 661512112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×211215166² = 89223692696815112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211215166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211215161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1427056 + ... + 1427203.

It is an arithmetic number, because the mean of its divisors is an integer number (40673205).

Almost surely, 2^211215166 is an apocalyptic number.

211215166 is a deficient number, since it is larger than the sum of its proper divisors (114170474).

211215166 is a wasteful number, since it uses less digits than its factorization.

211215166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2854298.

The product of its digits is 720, while the sum is 25.

The square root of 211215166 is about 14533.2434783155. The cubic root of 211215166 is about 595.5364754016.

Adding to 211215166 its reverse (661512112), we get a palindrome (872727278).

The spelling of 211215166 in words is "two hundred eleven million, two hundred fifteen thousand, one hundred sixty-six".