121120201111 has 24 divisors (see below), whose sum is σ = 156965195520. Its totient is φ = 92526823872.

The previous prime is 121120201063. The next prime is 121120201129. The reversal of 121120201111 is 111102021121.

It is a happy number.

It is not a de Polignac number, because 121120201111 - 2¹⁷ = 121120070039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 121120201091 and 121120201100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121120201171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3259831 + ... + 3296776.

It is an arithmetic number, because the mean of its divisors is an integer number (6540216480).

Almost surely, 2^121120201111 is an apocalyptic number.

121120201111 is a deficient number, since it is larger than the sum of its proper divisors (35844994409).

121120201111 is a wasteful number, since it uses less digits than its factorization.

121120201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6556663 (or 6556656 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121120201111 its reverse (111102021121), we get a palindrome (232222222232).

The spelling of 121120201111 in words is "one hundred twenty-one billion, one hundred twenty million, two hundred one thousand, one hundred eleven".