111221012321 has 4 divisors (see below), whose sum is σ = 114808786944. Its totient is φ = 107633237700.

The previous prime is 111221012261. The next prime is 111221012327. The reversal of 111221012321 is 123210122111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111221012321 is a prime.

It is a super-2 number, since 2×111221012321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111221012321.

It is not an unprimeable number, because it can be changed into a prime (111221012327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1793887265 + ... + 1793887326.

It is an arithmetic number, because the mean of its divisors is an integer number (28702196736).

Almost surely, 2^111221012321 is an apocalyptic number.

It is an amenable number.

111221012321 is a deficient number, since it is larger than the sum of its proper divisors (3587774623).

111221012321 is an equidigital number, since it uses as much as digits as its factorization.

111221012321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3587774622.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 111221012321 its reverse (123210122111), we get a palindrome (234431134432).

The spelling of 111221012321 in words is "one hundred eleven billion, two hundred twenty-one million, twelve thousand, three hundred twenty-one".