111335642221 has 4 divisors (see below), whose sum is σ = 111373296732. Its totient is φ = 111297987712.

The previous prime is 111335642213. The next prime is 111335642237. The reversal of 111335642221 is 122246533111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 57606720196 + 53728922025 = 240014^2 + 231795^2 .

It is a cyclic number.

It is not a de Polignac number, because 111335642221 - 2³ = 111335642213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111335642251) 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, 18822820 + ... + 18828733.

It is an arithmetic number, because the mean of its divisors is an integer number (27843324183).

Almost surely, 2^111335642221 is an apocalyptic number.

It is an amenable number.

111335642221 is a deficient number, since it is larger than the sum of its proper divisors (37654511).

111335642221 is an equidigital number, since it uses as much as digits as its factorization.

111335642221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37654510.

The product of its digits is 8640, while the sum is 31.

The spelling of 111335642221 in words is "one hundred eleven billion, three hundred thirty-five million, six hundred forty-two thousand, two hundred twenty-one".