21104063 has 2 divisors, whose sum is σ = 21104064. Its totient is φ = 21104062.

The previous prime is 21104059. The next prime is 21104071. The reversal of 21104063 is 36040112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21104063 - 2² = 21104059 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 (21104033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552031 + 10552032.

It is an arithmetic number, because the mean of its divisors is an integer number (10552032).

Almost surely, 2^21104063 is an apocalyptic number.

21104063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104063 is an equidigital number, since it uses as much as digits as its factorization.

21104063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21104063 is about 4593.9158677538. The cubic root of 21104063 is about 276.3473842963.

Adding to 21104063 its reverse (36040112), we get a palindrome (57144175).

The spelling of 21104063 in words is "twenty-one million, one hundred four thousand, sixty-three".