21842063 has 4 divisors (see below), whose sum is σ = 21852600. Its totient is φ = 21831528.

The previous prime is 21842027. The next prime is 21842083. The reversal of 21842063 is 36024812.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21842063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21842083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1013 + ... + 6686.

It is an arithmetic number, because the mean of its divisors is an integer number (5463150).

Almost surely, 2^21842063 is an apocalyptic number.

21842063 is a deficient number, since it is larger than the sum of its proper divisors (10537).

21842063 is an equidigital number, since it uses as much as digits as its factorization.

21842063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10536.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21842063 is about 4673.5492936311. The cubic root of 21842063 is about 279.5317983158.

Adding to 21842063 its reverse (36024812), we get a palindrome (57866875).

The spelling of 21842063 in words is "twenty-one million, eight hundred forty-two thousand, sixty-three".