121217166 has 24 divisors (see below), whose sum is σ = 300157104. Its totient is φ = 34633440.

The previous prime is 121217149. The next prime is 121217219. The reversal of 121217166 is 661712121.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 480895 + ... + 481146.

It is an arithmetic number, because the mean of its divisors is an integer number (12506546).

Almost surely, 2^121217166 is an apocalyptic number.

121217166 is an abundant number, since it is smaller than the sum of its proper divisors (178939938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121217166 is a wasteful number, since it uses less digits than its factorization.

121217166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962056 (or 962053 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 121217166 is about 11009.8667566869. The cubic root of 121217166 is about 494.9044688616.

Adding to 121217166 its reverse (661712121), we get a palindrome (782929287).

The spelling of 121217166 in words is "one hundred twenty-one million, two hundred seventeen thousand, one hundred sixty-six".