21033221113 has 4 divisors (see below), whose sum is σ = 21546226548. Its totient is φ = 20520215680.

The previous prime is 21033221101. The next prime is 21033221161. The reversal of 21033221113 is 31112233012.

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 1411655184 + 19621565929 = 37572^2 + 140077^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033221113 - 2⁵ = 21033221081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033221513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256502656 + ... + 256502737.

It is an arithmetic number, because the mean of its divisors is an integer number (5386556637).

Almost surely, 2^21033221113 is an apocalyptic number.

It is an amenable number.

21033221113 is a deficient number, since it is larger than the sum of its proper divisors (513005435).

21033221113 is an equidigital number, since it uses as much as digits as its factorization.

21033221113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513005434.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21033221113 its reverse (31112233012), we get a palindrome (52145454125).

The spelling of 21033221113 in words is "twenty-one billion, thirty-three million, two hundred twenty-one thousand, one hundred thirteen".