111111444421 has 4 divisors (see below), whose sum is σ = 116959415200. Its totient is φ = 105263473644.

The previous prime is 111111444419. The next prime is 111111444461. The reversal of 111111444421 is 124444111111.

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 not a de Polignac number, because 111111444421 - 2¹ = 111111444419 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 (111111444461) 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, 2923985361 + ... + 2923985398.

It is an arithmetic number, because the mean of its divisors is an integer number (29239853800).

Almost surely, 2^111111444421 is an apocalyptic number.

It is an amenable number.

111111444421 is a deficient number, since it is larger than the sum of its proper divisors (5847970779).

111111444421 is an equidigital number, since it uses as much as digits as its factorization.

111111444421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5847970778.

The product of its digits is 512, while the sum is 25.

Adding to 111111444421 its reverse (124444111111), we get a palindrome (235555555532).

The spelling of 111111444421 in words is "one hundred eleven billion, one hundred eleven million, four hundred forty-four thousand, four hundred twenty-one".