121211022166 has 32 divisors (see below), whose sum is σ = 204382100160. Its totient is φ = 53493796224.

The previous prime is 121211022089. The next prime is 121211022167. The reversal of 121211022166 is 661220112121.

It is a super-2 number, since 2×121211022166² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121211022166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211022167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1899556 + ... + 1962328.

It is an arithmetic number, because the mean of its divisors is an integer number (6386940630).

Almost surely, 2^121211022166 is an apocalyptic number.

121211022166 is a deficient number, since it is larger than the sum of its proper divisors (83171077994).

121211022166 is a wasteful number, since it uses less digits than its factorization.

121211022166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66040.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 121211022166 its reverse (661220112121), we get a palindrome (782431134287).

The spelling of 121211022166 in words is "one hundred twenty-one billion, two hundred eleven million, twenty-two thousand, one hundred sixty-six".