21001029263 has 2 divisors, whose sum is σ = 21001029264. Its totient is φ = 21001029262.

The previous prime is 21001029229. The next prime is 21001029277. The reversal of 21001029263 is 36292010012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001029263 - 2¹⁰ = 21001028239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001029563) 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, 10500514631 + 10500514632.

It is an arithmetic number, because the mean of its divisors is an integer number (10500514632).

Almost surely, 2^21001029263 is an apocalyptic number.

21001029263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001029263 is an equidigital number, since it uses as much as digits as its factorization.

21001029263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 21001029263 its reverse (36292010012), we get a palindrome (57293039275).

The spelling of 21001029263 in words is "twenty-one billion, one million, twenty-nine thousand, two hundred sixty-three".