121220222111 has 4 divisors (see below), whose sum is σ = 125400229800. Its totient is φ = 117040214424.

The previous prime is 121220222059. The next prime is 121220222113. The reversal of 121220222111 is 111222022121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121220222111 - 2⁶ = 121220222047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121220222111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220222113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2090003801 + ... + 2090003858.

It is an arithmetic number, because the mean of its divisors is an integer number (31350057450).

Almost surely, 2^121220222111 is an apocalyptic number.

121220222111 is a deficient number, since it is larger than the sum of its proper divisors (4180007689).

121220222111 is an equidigital number, since it uses as much as digits as its factorization.

121220222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4180007688.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121220222111 its reverse (111222022121), we get a palindrome (232442244232).

The spelling of 121220222111 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, one hundred eleven".