121221222111 has 64 divisors (see below), whose sum is σ = 196729344000. Its totient is φ = 73162137600.

The previous prime is 121221222079. The next prime is 121221222113. The reversal of 121221222111 is 111222122121.

It is not a de Polignac number, because 121221222111 - 2⁵ = 121221222079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221222113) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 115558315 + ... + 115559363.

It is an arithmetic number, because the mean of its divisors is an integer number (3073896000).

Almost surely, 2^121221222111 is an apocalyptic number.

121221222111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121221222111 is a deficient number, since it is larger than the sum of its proper divisors (75508121889).

121221222111 is a wasteful number, since it uses less digits than its factorization.

121221222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317 (or 2311 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 121221222111 its reverse (111222122121), we get a palindrome (232443344232).

The spelling of 121221222111 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".