21301244 has 12 divisors (see below), whose sum is σ = 37749600. Its totient is φ = 10515648.

The previous prime is 21301229. The next prime is 21301253. The reversal of 21301244 is 44210312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33389 + ... + 34020.

It is an arithmetic number, because the mean of its divisors is an integer number (3145800).

Almost surely, 2^21301244 is an apocalyptic number.

It is an amenable number.

21301244 is a deficient number, since it is larger than the sum of its proper divisors (16448356).

21301244 is a wasteful number, since it uses less digits than its factorization.

21301244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67492 (or 67490 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21301244 is about 4615.3270740003. The cubic root of 21301244 is about 277.2053805766.

Adding to 21301244 its reverse (44210312), we get a palindrome (65511556).

The spelling of 21301244 in words is "twenty-one million, three hundred one thousand, two hundred forty-four".