21262248533 has 2 divisors, whose sum is σ = 21262248534. Its totient is φ = 21262248532.

The previous prime is 21262248523. The next prime is 21262248569. The reversal of 21262248533 is 33584226212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18517222084 + 2745026449 = 136078^2 + 52393^2 .

It is a cyclic number.

It is not a de Polignac number, because 21262248533 - 2¹⁰ = 21262247509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21262248523) 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, 10631124266 + 10631124267.

It is an arithmetic number, because the mean of its divisors is an integer number (10631124267).

Almost surely, 2^21262248533 is an apocalyptic number.

It is an amenable number.

21262248533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21262248533 is an equidigital number, since it uses as much as digits as its factorization.

21262248533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 38.

The spelling of 21262248533 in words is "twenty-one billion, two hundred sixty-two million, two hundred forty-eight thousand, five hundred thirty-three".