21031021133 has 2 divisors, whose sum is σ = 21031021134. Its totient is φ = 21031021132.

The previous prime is 21031021127. The next prime is 21031021177. The reversal of 21031021133 is 33112013012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15472125769 + 5558895364 = 124387^2 + 74558^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031021133 - 2⁴ = 21031021117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21031021733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515510566 + 10515510567.

It is an arithmetic number, because the mean of its divisors is an integer number (10515510567).

Almost surely, 2^21031021133 is an apocalyptic number.

It is an amenable number.

21031021133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031021133 is an equidigital number, since it uses as much as digits as its factorization.

21031021133 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21031021133 its reverse (33112013012), we get a palindrome (54143034145).

The spelling of 21031021133 in words is "twenty-one billion, thirty-one million, twenty-one thousand, one hundred thirty-three".