21153044 has 24 divisors (see below), whose sum is σ = 40769568. Its totient is φ = 9523040.

The previous prime is 21153043. The next prime is 21153047. The reversal of 21153044 is 44035112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2462 + ... + 6954.

It is an arithmetic number, because the mean of its divisors is an integer number (1698732).

Almost surely, 2^21153044 is an apocalyptic number.

It is an amenable number.

21153044 is a deficient number, since it is larger than the sum of its proper divisors (19616524).

21153044 is a wasteful number, since it uses less digits than its factorization.

21153044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4615 (or 4613 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21153044 is about 4599.2438508955. The cubic root of 21153044 is about 276.5610131896.

Adding to 21153044 its reverse (44035112), we get a palindrome (65188156).

The spelling of 21153044 in words is "twenty-one million, one hundred fifty-three thousand, forty-four".