111000133121221 has 4 divisors (see below), whose sum is σ = 111001289601100. Its totient is φ = 110998976641344.

The previous prime is 111000133121219. The next prime is 111000133121261. The reversal of 111000133121221 is 122121331000111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8123132712321 + 102877000408900 = 2850111^2 + 10142830^2 .

It is a cyclic number.

It is not a de Polignac number, because 111000133121221 - 2¹ = 111000133121219 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 (111000133121261) 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, 578095956 + ... + 578287933.

It is an arithmetic number, because the mean of its divisors is an integer number (27750322400275).

Almost surely, 2^{111000133121221} is an apocalyptic number.

It is an amenable number.

111000133121221 is a deficient number, since it is larger than the sum of its proper divisors (1156479879).

111000133121221 is an equidigital number, since it uses as much as digits as its factorization.

111000133121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156479878.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 111000133121221 its reverse (122121331000111), we get a palindrome (233121464121332).

The spelling of 111000133121221 in words is "one hundred eleven trillion, one hundred thirty-three million, one hundred twenty-one thousand, two hundred twenty-one".