121220112011111 has 32 divisors (see below), whose sum is σ = 135635664844800. Its totient is φ = 107740444331520.

The previous prime is 121220112011059. The next prime is 121220112011147. The reversal of 121220112011111 is 111110211022121.

It is a cyclic number.

It is not a de Polignac number, because 121220112011111 - 2¹⁴ = 121220111994727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121220112011111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220112011191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 486037301 + ... + 486286641.

It is an arithmetic number, because the mean of its divisors is an integer number (4238614526400).

Almost surely, 2^{121220112011111} is an apocalyptic number.

121220112011111 is a deficient number, since it is larger than the sum of its proper divisors (14415552833689).

121220112011111 is a wasteful number, since it uses less digits than its factorization.

121220112011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265199.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 121220112011111 its reverse (111110211022121), we get a palindrome (232330323033232).

The spelling of 121220112011111 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred twelve million, eleven thousand, one hundred eleven".