111221201522 has 18 divisors (see below), whose sum is σ = 174417742317. Its totient is φ = 53187560536.

The previous prime is 111221201501. The next prime is 111221201527. The reversal of 111221201522 is 225102122111.

It can be written as a sum of positive squares in 2 ways, for example, as 91517745361 + 19703456161 = 302519^2 + 140369^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=235819.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111221201494 and 111221201503.

It is not an unprimeable number, because it can be changed into a prime (111221201527) 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, 10842548 + ... + 10852800.

Almost surely, 2^111221201522 is an apocalyptic number.

111221201522 is a deficient number, since it is larger than the sum of its proper divisors (63196540795).

111221201522 is an frugal number, since it uses more digits than its factorization.

111221201522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20554 (or 10278 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

Adding to 111221201522 its reverse (225102122111), we get a palindrome (336323323633).

The spelling of 111221201522 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred one thousand, five hundred twenty-two".