111243312021 has 32 divisors (see below), whose sum is σ = 156579264000. Its totient is φ = 70057528128.

The previous prime is 111243311969. The next prime is 111243312023. The reversal of 111243312021 is 120213342111.

It is not a de Polignac number, because 111243312021 - 2¹⁴ = 111243295637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111243312023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39127426 + ... + 39130268.

It is an arithmetic number, because the mean of its divisors is an integer number (4893102000).

Almost surely, 2^111243312021 is an apocalyptic number.

It is an amenable number.

111243312021 is a deficient number, since it is larger than the sum of its proper divisors (45335951979).

111243312021 is a wasteful number, since it uses less digits than its factorization.

111243312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4593.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 111243312021 its reverse (120213342111), we get a palindrome (231456654132).

The spelling of 111243312021 in words is "one hundred eleven billion, two hundred forty-three million, three hundred twelve thousand, twenty-one".