21052344 has 16 divisors (see below), whose sum is σ = 52630920. Its totient is φ = 7017440.

The previous prime is 21052333. The next prime is 21052349. The reversal of 21052344 is 44325012.

It is a self number, because there is not a number n which added to its sum of digits gives 21052344.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21052349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438567 + ... + 438614.

Almost surely, 2^21052344 is an apocalyptic number.

21052344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21052344 is an abundant number, since it is smaller than the sum of its proper divisors (31578576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21052344 is a wasteful number, since it uses less digits than its factorization.

21052344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877190 (or 877186 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21052344 is about 4588.2833391150. The cubic root of 21052344 is about 276.1214546322.

Adding to 21052344 its reverse (44325012), we get a palindrome (65377356).

The spelling of 21052344 in words is "twenty-one million, fifty-two thousand, three hundred forty-four".