111221320424 has 16 divisors (see below), whose sum is σ = 208555858500. Its totient is φ = 55606424832.

The previous prime is 111221320367. The next prime is 111221320481. The reversal of 111221320424 is 424023122111.

It is an interprime number because it is at equal distance from previous prime (111221320367) and next prime (111221320481).

It can be written as a sum of positive squares in 2 ways, for example, as 104317372324 + 6903948100 = 322982^2 + 83090^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 111221320424.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416399 + ... + 629150.

Almost surely, 2^111221320424 is an apocalyptic number.

It is an amenable number.

111221320424 is a deficient number, since it is larger than the sum of its proper divisors (97334538076).

111221320424 is a wasteful number, since it uses less digits than its factorization.

111221320424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058852 (or 1058848 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 111221320424 its reverse (424023122111), we get a palindrome (535244442535).

The spelling of 111221320424 in words is "one hundred eleven billion, two hundred twenty-one million, three hundred twenty thousand, four hundred twenty-four".