21143263 has 2 divisors, whose sum is σ = 21143264. Its totient is φ = 21143262.

The previous prime is 21143261. The next prime is 21143267. The reversal of 21143263 is 36234112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21143263 - 2¹ = 21143261 is a prime.

Together with 21143261, 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 (21143261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571631 + 10571632.

It is an arithmetic number, because the mean of its divisors is an integer number (10571632).

Almost surely, 2^21143263 is an apocalyptic number.

21143263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21143263 is an equidigital number, since it uses as much as digits as its factorization.

21143263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

The square root of 21143263 is about 4598.1804009847. The cubic root of 21143263 is about 276.5183800772.

Adding to 21143263 its reverse (36234112), we get a palindrome (57377375).

The spelling of 21143263 in words is "twenty-one million, one hundred forty-three thousand, two hundred sixty-three".