111111012020121 has 32 divisors (see below), whose sum is σ = 156165014016000. Its totient is φ = 70076564707968.

The previous prime is 111111012020059. The next prime is 111111012020161. The reversal of 111111012020121 is 121020210111111.

It is not a de Polignac number, because 111111012020121 - 2¹⁴ = 111111012003737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111111012020121.

It is not an unprimeable number, because it can be changed into a prime (111111012020161) 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, 115830100 + ... + 116785418.

It is an arithmetic number, because the mean of its divisors is an integer number (4880156688000).

Almost surely, 2^{111111012020121} is an apocalyptic number.

It is an amenable number.

111111012020121 is a deficient number, since it is larger than the sum of its proper divisors (45054001995879).

111111012020121 is a wasteful number, since it uses less digits than its factorization.

111111012020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958213.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 111111012020121 its reverse (121020210111111), we get a palindrome (232131222131232).

The spelling of 111111012020121 in words is "one hundred eleven trillion, one hundred eleven billion, twelve million, twenty thousand, one hundred twenty-one".