21063023 has 4 divisors (see below), whose sum is σ = 21192408. Its totient is φ = 20933640.

The previous prime is 21063013. The next prime is 21063041. The reversal of 21063023 is 32036012.

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

It is a cyclic number.

It is not a de Polignac number, because 21063023 - 2⁶ = 21062959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21062992 and 21063010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21063013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64448 + ... + 64773.

It is an arithmetic number, because the mean of its divisors is an integer number (5298102).

Almost surely, 2^21063023 is an apocalyptic number.

21063023 is a deficient number, since it is larger than the sum of its proper divisors (129385).

21063023 is a wasteful number, since it uses less digits than its factorization.

21063023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129384.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 21063023 is about 4589.4469165685. The cubic root of 21063023 is about 276.1681351439.

Adding to 21063023 its reverse (32036012), we get a palindrome (53099035).

The spelling of 21063023 in words is "twenty-one million, sixty-three thousand, twenty-three".