21040334 has 32 divisors (see below), whose sum is σ = 38465280. Its totient is φ = 8430912.

The previous prime is 21040297. The next prime is 21040387. The reversal of 21040334 is 43304012.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21602 + ... + 22554.

It is an arithmetic number, because the mean of its divisors is an integer number (1202040).

Almost surely, 2^21040334 is an apocalyptic number.

21040334 is a deficient number, since it is larger than the sum of its proper divisors (17424946).

21040334 is a wasteful number, since it uses less digits than its factorization.

21040334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21040334 is about 4586.9743840575. The cubic root of 21040334 is about 276.0689371313.

Adding to 21040334 its reverse (43304012), we get a palindrome (64344346).

The spelling of 21040334 in words is "twenty-one million, forty thousand, three hundred thirty-four".