21201126533 has 2 divisors, whose sum is σ = 21201126534. Its totient is φ = 21201126532.

The previous prime is 21201126481. The next prime is 21201126539. The reversal of 21201126533 is 33562110212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21111218209 + 89908324 = 145297^2 + 9482^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201126533 - 2¹⁸ = 21200864389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201126539) 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, 10600563266 + 10600563267.

It is an arithmetic number, because the mean of its divisors is an integer number (10600563267).

Almost surely, 2^21201126533 is an apocalyptic number.

It is an amenable number.

21201126533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201126533 is an equidigital number, since it uses as much as digits as its factorization.

21201126533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 21201126533 its reverse (33562110212), we get a palindrome (54763236745).

The spelling of 21201126533 in words is "twenty-one billion, two hundred one million, one hundred twenty-six thousand, five hundred thirty-three".