21244610 has 16 divisors (see below), whose sum is σ = 39474432. Its totient is φ = 8223600.

The previous prime is 21244609. The next prime is 21244631. The reversal of 21244610 is 1644212.

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, 33956 + ... + 34575.

It is an arithmetic number, because the mean of its divisors is an integer number (2467152).

Almost surely, 2^21244610 is an apocalyptic number.

21244610 is a deficient number, since it is larger than the sum of its proper divisors (18229822).

21244610 is a wasteful number, since it uses less digits than its factorization.

21244610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68569.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21244610 is about 4609.1875639857. The cubic root of 21244610 is about 276.9594922237.

Adding to 21244610 its reverse (1644212), we get a palindrome (22888822).

The spelling of 21244610 in words is "twenty-one million, two hundred forty-four thousand, six hundred ten".