121223513111 has 4 divisors (see below), whose sum is σ = 121224696912. Its totient is φ = 121222329312.

The previous prime is 121223513107. The next prime is 121223513129. The reversal of 121223513111 is 111315322121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111315322121 = 2069 ⋅53801509.

It is a cyclic number.

It is not a de Polignac number, because 121223513111 - 2² = 121223513107 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 (121223519111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422051 + ... + 648516.

It is an arithmetic number, because the mean of its divisors is an integer number (30306174228).

Almost surely, 2^121223513111 is an apocalyptic number.

121223513111 is a deficient number, since it is larger than the sum of its proper divisors (1183801).

121223513111 is a wasteful number, since it uses less digits than its factorization.

121223513111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183800.

The product of its digits is 360, while the sum is 23.

Adding to 121223513111 its reverse (111315322121), we get a palindrome (232538835232).

The spelling of 121223513111 in words is "one hundred twenty-one billion, two hundred twenty-three million, five hundred thirteen thousand, one hundred eleven".