111221123121 has 48 divisors (see below), whose sum is σ = 169992478656. Its totient is φ = 69995173248.

The previous prime is 111221123081. The next prime is 111221123141. The reversal of 111221123121 is 121321122111.

It is a happy number.

It is not a de Polignac number, because 111221123121 - 2²³ = 111212734513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111221123094 and 111221123103.

It is not an unprimeable number, because it can be changed into a prime (111221123141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1333771 + ... + 1414703.

It is an arithmetic number, because the mean of its divisors is an integer number (3541509972).

Almost surely, 2^111221123121 is an apocalyptic number.

It is an amenable number.

111221123121 is a deficient number, since it is larger than the sum of its proper divisors (58771355535).

111221123121 is a wasteful number, since it uses less digits than its factorization.

111221123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81102 (or 81099 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 111221123121 its reverse (121321122111), we get a palindrome (232542245232).

The spelling of 111221123121 in words is "one hundred eleven billion, two hundred twenty-one million, one hundred twenty-three thousand, one hundred twenty-one".