121222111 has 4 divisors (see below), whose sum is σ = 121245552. Its totient is φ = 121198672.

The previous prime is 121222099. The next prime is 121222133. The reversal of 121222111 is 111222121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111222121 = 467 ⋅238163.

It is a cyclic number.

It is not a de Polignac number, because 121222111 - 2⁹ = 121221599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121222091 and 121222100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222141) 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 3 ways as a sum of consecutive naturals, for example, 166 + ... + 15571.

It is an arithmetic number, because the mean of its divisors is an integer number (30311388).

Almost surely, 2^121222111 is an apocalyptic number.

121222111 is a deficient number, since it is larger than the sum of its proper divisors (23441).

121222111 is an equidigital number, since it uses as much as digits as its factorization.

121222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23440.

The product of its digits is 16, while the sum is 13.

The square root of 121222111 is about 11010.0913256884. The cubic root of 121222111 is about 494.9111985722.

Adding to 121222111 its reverse (111222121), we get a palindrome (232444232).

The spelling of 121222111 in words is "one hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".