21223050533 has 2 divisors, whose sum is σ = 21223050534. Its totient is φ = 21223050532.

The previous prime is 21223050503. The next prime is 21223050551. The reversal of 21223050533 is 33505032212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17075432929 + 4147617604 = 130673^2 + 64402^2 .

It is a cyclic number.

It is not a de Polignac number, because 21223050533 - 2²⁴ = 21206273317 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223050503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611525266 + 10611525267.

It is an arithmetic number, because the mean of its divisors is an integer number (10611525267).

Almost surely, 2^21223050533 is an apocalyptic number.

It is an amenable number.

21223050533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223050533 is an equidigital number, since it uses as much as digits as its factorization.

21223050533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 26.

Adding to 21223050533 its reverse (33505032212), we get a palindrome (54728082745).

The spelling of 21223050533 in words is "twenty-one billion, two hundred twenty-three million, fifty thousand, five hundred thirty-three".