111222353521 has 16 divisors (see below), whose sum is σ = 113199781968. Its totient is φ = 109264896000.

The previous prime is 111222353519. The next prime is 111222353597. The reversal of 111222353521 is 125353222111.

It can be written as a sum of positive squares in 8 ways, for example, as 756525025 + 110465828496 = 27505^2 + 332364^2 .

It is a cyclic number.

It is not a de Polignac number, because 111222353521 - 2¹ = 111222353519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111222353521.

It is not an unprimeable number, because it can be changed into a prime (111222353621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8347761 + ... + 8361073.

It is an arithmetic number, because the mean of its divisors is an integer number (7074986373).

Almost surely, 2^111222353521 is an apocalyptic number.

It is an amenable number.

111222353521 is a deficient number, since it is larger than the sum of its proper divisors (1977428447).

111222353521 is a wasteful number, since it uses less digits than its factorization.

111222353521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14052.

The product of its digits is 3600, while the sum is 28.

Adding to 111222353521 its reverse (125353222111), we get a palindrome (236575575632).

The spelling of 111222353521 in words is "one hundred eleven billion, two hundred twenty-two million, three hundred fifty-three thousand, five hundred twenty-one".