121220201111 has 16 divisors (see below), whose sum is σ = 127278291168. Its totient is φ = 115344768000.

The previous prime is 121220201107. The next prime is 121220201119. The reversal of 121220201111 is 111102022121.

It is a cyclic number.

It is not a de Polignac number, because 121220201111 - 2² = 121220201107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220201119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58991 + ... + 495903.

It is an arithmetic number, because the mean of its divisors is an integer number (7954893198).

Almost surely, 2^121220201111 is an apocalyptic number.

121220201111 is a deficient number, since it is larger than the sum of its proper divisors (6058090057).

121220201111 is a wasteful number, since it uses less digits than its factorization.

121220201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437122.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121220201111 its reverse (111102022121), we get a palindrome (232322223232).

The spelling of 121220201111 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred one thousand, one hundred eleven".