21026224 has 40 divisors (see below), whose sum is σ = 41997312. Its totient is φ = 10194240.

The previous prime is 21026197. The next prime is 21026231. The reversal of 21026224 is 42262012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94177 + ... + 94399.

Almost surely, 2^21026224 is an apocalyptic number.

It is an amenable number.

21026224 is a deficient number, since it is larger than the sum of its proper divisors (20971088).

21026224 is a wasteful number, since it uses less digits than its factorization.

21026224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21026224 is about 4585.4360752277. The cubic root of 21026224 is about 276.0072111817.

Adding to 21026224 its reverse (42262012), we get a palindrome (63288236).

The spelling of 21026224 in words is "twenty-one million, twenty-six thousand, two hundred twenty-four".