111222020121 has 16 divisors (see below), whose sum is σ = 149088192960. Its totient is φ = 73752053760.

The previous prime is 111222020111. The next prime is 111222020183. The reversal of 111222020121 is 121020222111.

It is not a de Polignac number, because 111222020121 - 2³³ = 102632085529 is a prime.

It is a super-3 number, since 3×111222020121³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111222020121.

It is not an unprimeable number, because it can be changed into a prime (111222020111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5072101 + ... + 5093981.

It is an arithmetic number, because the mean of its divisors is an integer number (9318012060).

Almost surely, 2^111222020121 is an apocalyptic number.

It is an amenable number.

111222020121 is a deficient number, since it is larger than the sum of its proper divisors (37866172839).

111222020121 is a wasteful number, since it uses less digits than its factorization.

111222020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30856.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 111222020121 its reverse (121020222111), we get a palindrome (232242242232).

The spelling of 111222020121 in words is "one hundred eleven billion, two hundred twenty-two million, twenty thousand, one hundred twenty-one".