21050234533 has 2 divisors, whose sum is σ = 21050234534. Its totient is φ = 21050234532.

The previous prime is 21050234507. The next prime is 21050234537. The reversal of 21050234533 is 33543205012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13706087329 + 7344147204 = 117073^2 + 85698^2 .

It is a cyclic number.

It is not a de Polignac number, because 21050234533 - 2¹³ = 21050226341 is a prime.

It is a super-2 number, since 2×21050234533² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21050234537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10525117266 + 10525117267.

It is an arithmetic number, because the mean of its divisors is an integer number (10525117267).

Almost surely, 2^21050234533 is an apocalyptic number.

It is an amenable number.

21050234533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21050234533 is an equidigital number, since it uses as much as digits as its factorization.

21050234533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 28.

Adding to 21050234533 its reverse (33543205012), we get a palindrome (54593439545).

The spelling of 21050234533 in words is "twenty-one billion, fifty million, two hundred thirty-four thousand, five hundred thirty-three".