21033104 has 10 divisors (see below), whose sum is σ = 40751670. Its totient is φ = 10516544.

The previous prime is 21033083. The next prime is 21033119. The reversal of 21033104 is 40133012.

It can be written as a sum of positive squares in only one way, i.e., 17977600 + 3055504 = 4240^2 + 1748^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657269 + ... + 657300.

It is an arithmetic number, because the mean of its divisors is an integer number (4075167).

Almost surely, 2^21033104 is an apocalyptic number.

It is an amenable number.

21033104 is a deficient number, since it is larger than the sum of its proper divisors (19718566).

21033104 is a wasteful number, since it uses less digits than its factorization.

21033104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314577 (or 1314571 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21033104 is about 4586.1862151465. The cubic root of 21033104 is about 276.0373120459.

Adding to 21033104 its reverse (40133012), we get a palindrome (61166116).

The spelling of 21033104 in words is "twenty-one million, thirty-three thousand, one hundred four".