111323312021 has 4 divisors (see below), whose sum is σ = 112848288972. Its totient is φ = 109798335072.

The previous prime is 111323312003. The next prime is 111323312039. The reversal of 111323312021 is 120213323111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (111323312003) and next prime (111323312039).

It can be written as a sum of positive squares in 2 ways, for example, as 94120104100 + 17203207921 = 306790^2 + 131161^2 .

It is a cyclic number.

It is not a de Polignac number, because 111323312021 - 2¹⁰ = 111323310997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111323311984 and 111323312002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111323312041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 762488366 + ... + 762488511.

It is an arithmetic number, because the mean of its divisors is an integer number (28212072243).

Almost surely, 2^111323312021 is an apocalyptic number.

It is an amenable number.

111323312021 is a deficient number, since it is larger than the sum of its proper divisors (1524976951).

111323312021 is an equidigital number, since it uses as much as digits as its factorization.

111323312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524976950.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 111323312021 its reverse (120213323111), we get a palindrome (231536635132).

The spelling of 111323312021 in words is "one hundred eleven billion, three hundred twenty-three million, three hundred twelve thousand, twenty-one".