1223111202111 has 16 divisors (see below), whose sum is σ = 1812478648320. Its totient is φ = 815199544440.

The previous prime is 1223111202031. The next prime is 1223111202151. The reversal of 1223111202111 is 1112021113221.

It is a happy number.

1223111202111 is a `hidden beast` number, since 1 + 22 + 311 + 120 + 211 + 1 = 666.

It is not a de Polignac number, because 1223111202111 - 2¹¹ = 1223111200063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223111202151) 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, 5667775 + ... + 5879616.

It is an arithmetic number, because the mean of its divisors is an integer number (113279915520).

Almost surely, 2^{1223111202111} is an apocalyptic number.

1223111202111 is a deficient number, since it is larger than the sum of its proper divisors (589367446209).

1223111202111 is a wasteful number, since it uses less digits than its factorization.

1223111202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11551323 (or 11551317 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1223111202111 its reverse (1112021113221), we get a palindrome (2335132315332).

The spelling of 1223111202111 in words is "one trillion, two hundred twenty-three billion, one hundred eleven million, two hundred two thousand, one hundred eleven".