111221011002121 has 12 divisors (see below), whose sum is σ = 116286768388420. Its totient is φ = 106367185251360.

The previous prime is 111221011002047. The next prime is 111221011002133. The reversal of 111221011002121 is 121200110122111.

It can be written as a sum of positive squares in 2 ways, for example, as 33148518375625 + 78072492626496 = 5757475^2 + 8835864^2 .

It is not a de Polignac number, because 111221011002121 - 2¹³ = 111221010993929 is a prime.

It is a super-2 number, since 2×111221011002121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111221011002095 and 111221011002104.

It is not an unprimeable number, because it can be changed into a prime (111221011002151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14807010 + ... + 21016411.

Almost surely, 2^{111221011002121} is an apocalyptic number.

It is an amenable number.

111221011002121 is a deficient number, since it is larger than the sum of its proper divisors (5065757386299).

111221011002121 is an equidigital number, since it uses as much as digits as its factorization.

111221011002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35829336 (or 35829313 counting only the distinct ones).

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

Adding to 111221011002121 its reverse (121200110122111), we get a palindrome (232421121124232).

The spelling of 111221011002121 in words is "one hundred eleven trillion, two hundred twenty-one billion, eleven million, two thousand, one hundred twenty-one".