21650263 has 2 divisors, whose sum is σ = 21650264. Its totient is φ = 21650262.

The previous prime is 21650261. The next prime is 21650281. The reversal of 21650263 is 36205612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21650263 - 2¹ = 21650261 is a prime.

Together with 21650261, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21650261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10825131 + 10825132.

It is an arithmetic number, because the mean of its divisors is an integer number (10825132).

Almost surely, 2^21650263 is an apocalyptic number.

21650263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21650263 is an equidigital number, since it uses as much as digits as its factorization.

21650263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 21650263 is about 4652.9843111706. The cubic root of 21650263 is about 278.7111813600.

Adding to 21650263 its reverse (36205612), we get a palindrome (57855875).

The spelling of 21650263 in words is "twenty-one million, six hundred fifty thousand, two hundred sixty-three".