21152344 has 8 divisors (see below), whose sum is σ = 39660660. Its totient is φ = 10576168.

The previous prime is 21152333. The next prime is 21152381. The reversal of 21152344 is 44325112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1322014 + ... + 1322029.

Almost surely, 2^21152344 is an apocalyptic number.

It is an amenable number.

21152344 is a deficient number, since it is larger than the sum of its proper divisors (18508316).

21152344 is a wasteful number, since it uses less digits than its factorization.

21152344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644049 (or 2644045 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 21152344 is about 4599.1677508001. The cubic root of 21152344 is about 276.5579624885.

Adding to 21152344 its reverse (44325112), we get a palindrome (65477456).

The spelling of 21152344 in words is "twenty-one million, one hundred fifty-two thousand, three hundred forty-four".