111021573601 has 9 divisors (see below), whose sum is σ = 112165680403. Its totient is φ = 109889030200.

The previous prime is 111021573587. The next prime is 111021573629. The reversal of 111021573601 is 106375120111.

The square root of 111021573601 is 333199.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 106668213201 + 4353360400 = 326601^2 + 65980^2 .

It is not a de Polignac number, because 111021573601 - 2⁷ = 111021573473 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 111021573601.

It is not an unprimeable number, because it can be changed into a prime (111021573631) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 33651450 + ... + 33654748.

Almost surely, 2^111021573601 is an apocalyptic number.

111021573601 is the 333199-th square number.

111021573601 is the 166600-th centered octagonal number.

It is an amenable number.

111021573601 is a deficient number, since it is larger than the sum of its proper divisors (1144106802).

111021573601 is an frugal number, since it uses more digits than its factorization.

111021573601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6800 (or 3400 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 28.

Adding to 111021573601 its reverse (106375120111), we get a palindrome (217396693712).

The spelling of 111021573601 in words is "one hundred eleven billion, twenty-one million, five hundred seventy-three thousand, six hundred one".