111221011321 has 16 divisors (see below), whose sum is σ = 130346850304. Its totient is φ = 92914035984.

The previous prime is 111221011301. The next prime is 111221011351. The reversal of 111221011321 is 123110122111.

It is a happy number.

It is not a de Polignac number, because 111221011321 - 2²⁵ = 111187456889 is a prime.

It is a super-2 number, since 2×111221011321² (a number of 23 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 = 111221011295 and 111221011304.

It is not an unprimeable number, because it can be changed into a prime (111221011301) 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, 259671 + ... + 538396.

It is an arithmetic number, because the mean of its divisors is an integer number (8146678144).

Almost surely, 2^111221011321 is an apocalyptic number.

It is an amenable number.

111221011321 is a deficient number, since it is larger than the sum of its proper divisors (19125838983).

111221011321 is an equidigital number, since it uses as much as digits as its factorization.

111221011321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798580.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 111221011321 its reverse (123110122111), we get a palindrome (234331133432).

The spelling of 111221011321 in words is "one hundred eleven billion, two hundred twenty-one million, eleven thousand, three hundred twenty-one".