21223063 has 4 divisors (see below), whose sum is σ = 21417880. Its totient is φ = 21028248.

The previous prime is 21223061. The next prime is 21223073. The reversal of 21223063 is 36032212.

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 21223063 - 2¹ = 21223061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21223063.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223061) 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, 97245 + ... + 97462.

It is an arithmetic number, because the mean of its divisors is an integer number (5354470).

Almost surely, 2^21223063 is an apocalyptic number.

21223063 is a deficient number, since it is larger than the sum of its proper divisors (194817).

21223063 is a wasteful number, since it uses less digits than its factorization.

21223063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194816.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 21223063 is about 4606.8495742752. The cubic root of 21223063 is about 276.8658266642.

Adding to 21223063 its reverse (36032212), we get a palindrome (57255275).

The spelling of 21223063 in words is "twenty-one million, two hundred twenty-three thousand, sixty-three".