21202121133 has 12 divisors (see below), whose sum is σ = 30633296928. Its totient is φ = 14131050120.

The previous prime is 21202121111. The next prime is 21202121173. The reversal of 21202121133 is 33112120212.

It is a de Polignac number, because none of the positive numbers 2^k-21202121133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202121173) 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 11 ways as a sum of consecutive naturals, for example, 271563 + ... + 340808.

It is an arithmetic number, because the mean of its divisors is an integer number (2552774744).

Almost surely, 2^21202121133 is an apocalyptic number.

It is an amenable number.

21202121133 is a deficient number, since it is larger than the sum of its proper divisors (9431175795).

21202121133 is a wasteful number, since it uses less digits than its factorization.

21202121133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616224 (or 616221 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21202121133 its reverse (33112120212), we get a palindrome (54314241345).

The spelling of 21202121133 in words is "twenty-one billion, two hundred two million, one hundred twenty-one thousand, one hundred thirty-three".