21301144 has 16 divisors (see below), whose sum is σ = 40173120. Its totient is φ = 10588320.

The previous prime is 21301097. The next prime is 21301157. The reversal of 21301144 is 44110312.

It is a congruent number.

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, 6312 + ... + 9079.

It is an arithmetic number, because the mean of its divisors is an integer number (2510820).

Almost surely, 2^21301144 is an apocalyptic number.

It is an amenable number.

21301144 is a deficient number, since it is larger than the sum of its proper divisors (18871976).

21301144 is a wasteful number, since it uses less digits than its factorization.

21301144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15570 (or 15566 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21301144 is about 4615.3162405192. The cubic root of 21301144 is about 277.2049467900.

Adding to 21301144 its reverse (44110312), we get a palindrome (65411456).

The spelling of 21301144 in words is "twenty-one million, three hundred one thousand, one hundred forty-four".