21035404 has 12 divisors (see below), whose sum is σ = 39643744. Its totient is φ = 9708624.

The previous prime is 21035401. The next prime is 21035429. The reversal of 21035404 is 40453012.

It is not an unprimeable number, because it can be changed into a prime (21035401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202212 + ... + 202315.

Almost surely, 2^21035404 is an apocalyptic number.

It is an amenable number.

21035404 is a deficient number, since it is larger than the sum of its proper divisors (18608340).

21035404 is a wasteful number, since it uses less digits than its factorization.

21035404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404544 (or 404542 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21035404 is about 4586.4369613023. The cubic root of 21035404 is about 276.0473733707.

Adding to 21035404 its reverse (40453012), we get a palindrome (61488416).

The spelling of 21035404 in words is "twenty-one million, thirty-five thousand, four hundred four".