21224488 has 16 divisors (see below), whose sum is σ = 39844980. Its totient is φ = 10599168.

The previous prime is 21224479. The next prime is 21224503. The reversal of 21224488 is 88442212.

It can be written as a sum of positive squares in 2 ways, for example, as 20268004 + 956484 = 4502^2 + 978^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11056 + ... + 12832.

Almost surely, 2^21224488 is an apocalyptic number.

It is an amenable number.

21224488 is a deficient number, since it is larger than the sum of its proper divisors (18620492).

21224488 is a wasteful number, since it uses less digits than its factorization.

21224488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3276 (or 3272 counting only the distinct ones).

The product of its digits is 8192, while the sum is 31.

The square root of 21224488 is about 4607.0042326874. The cubic root of 21224488 is about 276.8720231460.

It can be divided in two parts, 21224 and 488, that added together give a palindrome (21712).

The spelling of 21224488 in words is "twenty-one million, two hundred twenty-four thousand, four hundred eighty-eight".