20211131533 has 2 divisors, whose sum is σ = 20211131534. Its totient is φ = 20211131532.

The previous prime is 20211131531. The next prime is 20211131537. The reversal of 20211131533 is 33513111202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19938287209 + 272844324 = 141203^2 + 16518^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211131533 - 2¹ = 20211131531 is a prime.

Together with 20211131531, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211131531) 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, 10105565766 + 10105565767.

It is an arithmetic number, because the mean of its divisors is an integer number (10105565767).

Almost surely, 2^20211131533 is an apocalyptic number.

It is an amenable number.

20211131533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211131533 is an equidigital number, since it uses as much as digits as its factorization.

20211131533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 20211131533 its reverse (33513111202), we get a palindrome (53724242735).

The spelling of 20211131533 in words is "twenty billion, two hundred eleven million, one hundred thirty-one thousand, five hundred thirty-three".