111212201121 has 32 divisors (see below), whose sum is σ = 170853531648. Its totient is φ = 63029897280.

The previous prime is 111212201119. The next prime is 111212201141. The reversal of 111212201121 is 121102212111.

It is a happy number.

It is not a de Polignac number, because 111212201121 - 2¹ = 111212201119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111212201121.

It is not an unprimeable number, because it can be changed into a prime (111212201141) 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, 16588056 + ... + 16594758.

It is an arithmetic number, because the mean of its divisors is an integer number (5339172864).

Almost surely, 2^111212201121 is an apocalyptic number.

It is an amenable number.

111212201121 is a deficient number, since it is larger than the sum of its proper divisors (59641330527).

111212201121 is a wasteful number, since it uses less digits than its factorization.

111212201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13061.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111212201121 its reverse (121102212111), we get a palindrome (232314413232).

The spelling of 111212201121 in words is "one hundred eleven billion, two hundred twelve million, two hundred one thousand, one hundred twenty-one".