21112030133 has 4 divisors (see below), whose sum is σ = 21682625580. Its totient is φ = 20541434688.

The previous prime is 21112030111. The next prime is 21112030171. The reversal of 21112030133 is 33103021112.

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 11180313169 + 9931716964 = 105737^2 + 99658^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112030133 - 2¹² = 21112026037 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 (21112030183) 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, 285297668 + ... + 285297741.

It is an arithmetic number, because the mean of its divisors is an integer number (5420656395).

Almost surely, 2^21112030133 is an apocalyptic number.

It is an amenable number.

21112030133 is a deficient number, since it is larger than the sum of its proper divisors (570595447).

21112030133 is an equidigital number, since it uses as much as digits as its factorization.

21112030133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570595446.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21112030133 its reverse (33103021112), we get a palindrome (54215051245).

The spelling of 21112030133 in words is "twenty-one billion, one hundred twelve million, thirty thousand, one hundred thirty-three".