21353144 has 16 divisors (see below), whose sum is σ = 41119800. Its totient is φ = 10387872.

The previous prime is 21353119. The next prime is 21353153. The reversal of 21353144 is 44135312.

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, 35774 + ... + 36365.

Almost surely, 2^21353144 is an apocalyptic number.

It is an amenable number.

21353144 is a deficient number, since it is larger than the sum of its proper divisors (19766656).

21353144 is a wasteful number, since it uses less digits than its factorization.

21353144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72182 (or 72178 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 21353144 is about 4620.9462234482. The cubic root of 21353144 is about 277.4303328617.

Adding to 21353144 its reverse (44135312), we get a palindrome (65488456).

The spelling of 21353144 in words is "twenty-one million, three hundred fifty-three thousand, one hundred forty-four".