121122121201111 has 16 divisors (see below), whose sum is σ = 134724370867200. Its totient is φ = 108368915754528.

The previous prime is 121122121201069. The next prime is 121122121201129. The reversal of 121122121201111 is 111102121221121.

It is a cyclic number.

It is not a de Polignac number, because 121122121201111 - 2¹⁵ = 121122121168343 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121122121208111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1754189056 + ... + 1754258101.

It is an arithmetic number, because the mean of its divisors is an integer number (8420273179200).

Almost surely, 2^{121122121201111} is an apocalyptic number.

121122121201111 is a deficient number, since it is larger than the sum of its proper divisors (13602249666089).

121122121201111 is a wasteful number, since it uses less digits than its factorization.

121122121201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508447278.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 121122121201111 its reverse (111102121221121), we get a palindrome (232224242422232).

The spelling of 121122121201111 in words is "one hundred twenty-one trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred one thousand, one hundred eleven".