21246263 has 2 divisors, whose sum is σ = 21246264. Its totient is φ = 21246262.

The previous prime is 21246229. The next prime is 21246271. The reversal of 21246263 is 36264212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21246263 - 2¹⁶ = 21180727 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21243263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10623131 + 10623132.

It is an arithmetic number, because the mean of its divisors is an integer number (10623132).

Almost surely, 2^21246263 is an apocalyptic number.

21246263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21246263 is an equidigital number, since it uses as much as digits as its factorization.

21246263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 26.

The square root of 21246263 is about 4609.3668762640. The cubic root of 21246263 is about 276.9666752561.

The spelling of 21246263 in words is "twenty-one million, two hundred forty-six thousand, two hundred sixty-three".