111221111031121 has 16 divisors (see below), whose sum is σ = 136958337585664. Its totient is φ = 87953596041024.

The previous prime is 111221111031097. The next prime is 111221111031197. The reversal of 111221111031121 is 121130111122111.

It is a happy number.

It is not a de Polignac number, because 111221111031121 - 2⁷ = 111221111030993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111221111031521) 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, 315967401 + ... + 316319206.

It is an arithmetic number, because the mean of its divisors is an integer number (8559896099104).

Almost surely, 2^{111221111031121} is an apocalyptic number.

It is an amenable number.

111221111031121 is a deficient number, since it is larger than the sum of its proper divisors (25737226554543).

111221111031121 is a wasteful number, since it uses less digits than its factorization.

111221111031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632288560.

The product of its (nonzero) digits is 24, while the sum is 19.

Adding to 111221111031121 its reverse (121130111122111), we get a palindrome (232351222153232).

The spelling of 111221111031121 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred eleven million, thirty-one thousand, one hundred twenty-one".