21224410 has 8 divisors (see below), whose sum is σ = 38203956. Its totient is φ = 8489760.

The previous prime is 21224389. The next prime is 21224431. The reversal of 21224410 is 1442212.

It is an interprime number because it is at equal distance from previous prime (21224389) and next prime (21224431).

It can be written as a sum of positive squares in 2 ways, for example, as 20620681 + 603729 = 4541^2 + 777^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061211 + ... + 1061230.

Almost surely, 2^21224410 is an apocalyptic number.

21224410 is a deficient number, since it is larger than the sum of its proper divisors (16979546).

21224410 is a wasteful number, since it uses less digits than its factorization.

21224410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122448.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 21224410 is about 4606.9957673087. The cubic root of 21224410 is about 276.8716839774.

Adding to 21224410 its reverse (1442212), we get a palindrome (22666622).

The spelling of 21224410 in words is "twenty-one million, two hundred twenty-four thousand, four hundred ten".