21040352 has 24 divisors (see below), whose sum is σ = 41995296. Its totient is φ = 10374912.

The previous prime is 21040297. The next prime is 21040387. The reversal of 21040352 is 25304012.

It is a self number, because there is not a number n which added to its sum of digits gives 21040352.

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, 2168 + ... + 6839.

It is an arithmetic number, because the mean of its divisors is an integer number (1749804).

Almost surely, 2^21040352 is an apocalyptic number.

It is an amenable number.

21040352 is a deficient number, since it is larger than the sum of its proper divisors (20954944).

21040352 is an equidigital number, since it uses as much as digits as its factorization.

21040352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9090 (or 9082 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21040352 is about 4586.9763461348. The cubic root of 21040352 is about 276.0690158569.

Adding to 21040352 its reverse (25304012), we get a palindrome (46344364).

The spelling of 21040352 in words is "twenty-one million, forty thousand, three hundred fifty-two".