121221221266 has 16 divisors (see below), whose sum is σ = 183904128000. Its totient is φ = 59920062048.

The previous prime is 121221221239. The next prime is 121221221299. The reversal of 121221221266 is 662122122121.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1142335 + ... + 1243933.

It is an arithmetic number, because the mean of its divisors is an integer number (11494008000).

Almost surely, 2^121221221266 is an apocalyptic number.

121221221266 is a deficient number, since it is larger than the sum of its proper divisors (62682906734).

121221221266 is a wasteful number, since it uses less digits than its factorization.

121221221266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108393.

The product of its digits is 2304, while the sum is 28.

Adding to 121221221266 its reverse (662122122121), we get a palindrome (783343343387).

The spelling of 121221221266 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred sixty-six".