21260242063 has 2 divisors, whose sum is σ = 21260242064. Its totient is φ = 21260242062.

The previous prime is 21260242039. The next prime is 21260242117. The reversal of 21260242063 is 36024206212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21260242063 - 2¹³ = 21260233871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21260240063) 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, 10630121031 + 10630121032.

It is an arithmetic number, because the mean of its divisors is an integer number (10630121032).

Almost surely, 2^21260242063 is an apocalyptic number.

21260242063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21260242063 is an equidigital number, since it uses as much as digits as its factorization.

21260242063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21260242063 its reverse (36024206212), we get a palindrome (57284448275).

The spelling of 21260242063 in words is "twenty-one billion, two hundred sixty million, two hundred forty-two thousand, sixty-three".