21144063 has 4 divisors (see below), whose sum is σ = 28192088. Its totient is φ = 14096040.

The previous prime is 21144059. The next prime is 21144083. The reversal of 21144063 is 36044112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21144063 - 2² = 21144059 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 (21144043) 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, 3524008 + ... + 3524013.

It is an arithmetic number, because the mean of its divisors is an integer number (7048022).

Almost surely, 2^21144063 is an apocalyptic number.

21144063 is a deficient number, since it is larger than the sum of its proper divisors (7048025).

21144063 is an equidigital number, since it uses as much as digits as its factorization.

21144063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7048024.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21144063 is about 4598.2673910942. The cubic root of 21144063 is about 276.5218675855.

Adding to 21144063 its reverse (36044112), we get a palindrome (57188175).

The spelling of 21144063 in words is "twenty-one million, one hundred forty-four thousand, sixty-three".