21063224 has 32 divisors (see below), whose sum is σ = 48609120. Its totient is φ = 8332416.

The previous prime is 21063223. The next prime is 21063227. The reversal of 21063224 is 42236012.

It is a junction number, because it is equal to n+sod(n) for n = 21063196 and 21063205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21063223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13739 + ... + 15194.

It is an arithmetic number, because the mean of its divisors is an integer number (1519035).

Almost surely, 2^21063224 is an apocalyptic number.

It is an amenable number.

21063224 is an abundant number, since it is smaller than the sum of its proper divisors (27545896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21063224 is a wasteful number, since it uses less digits than its factorization.

21063224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28959 (or 28955 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21063224 is about 4589.4688145797. The cubic root of 21063224 is about 276.1690136126.

Adding to 21063224 its reverse (42236012), we get a palindrome (63299236).

The spelling of 21063224 in words is "twenty-one million, sixty-three thousand, two hundred twenty-four".