121222221211 has 16 divisors (see below), whose sum is σ = 155683390464. Its totient is φ = 91741994784.

The previous prime is 121222221209. The next prime is 121222221247. The reversal of 121222221211 is 112122222121.

It is a cyclic number.

It is not a de Polignac number, because 121222221211 - 2¹ = 121222221209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121222221251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28956871 + ... + 28961056.

It is an arithmetic number, because the mean of its divisors is an integer number (9730211904).

Almost surely, 2^121222221211 is an apocalyptic number.

121222221211 is a deficient number, since it is larger than the sum of its proper divisors (34461169253).

121222221211 is a wasteful number, since it uses less digits than its factorization.

121222221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57917970.

The product of its digits is 128, while the sum is 19.

Adding to 121222221211 its reverse (112122222121), we get a palindrome (233344443332).

The spelling of 121222221211 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred eleven".