21420031133 has 2 divisors, whose sum is σ = 21420031134. Its totient is φ = 21420031132.

The previous prime is 21420031099. The next prime is 21420031151. The reversal of 21420031133 is 33113002412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16942146244 + 4477884889 = 130162^2 + 66917^2 .

It is a cyclic number.

It is not a de Polignac number, because 21420031133 - 2¹⁰ = 21420030109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21420031163) 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 as a sum of consecutive naturals, namely, 10710015566 + 10710015567.

It is an arithmetic number, because the mean of its divisors is an integer number (10710015567).

Almost surely, 2^21420031133 is an apocalyptic number.

It is an amenable number.

21420031133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21420031133 is an equidigital number, since it uses as much as digits as its factorization.

21420031133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21420031133 its reverse (33113002412), we get a palindrome (54533033545).

The spelling of 21420031133 in words is "twenty-one billion, four hundred twenty million, thirty-one thousand, one hundred thirty-three".