21433304 has 8 divisors (see below), whose sum is σ = 40187460. Its totient is φ = 10716648.

The previous prime is 21433289. The next prime is 21433319. The reversal of 21433304 is 40333412.

It is an interprime number because it is at equal distance from previous prime (21433289) and next prime (21433319).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1339574 + ... + 1339589.

Almost surely, 2^21433304 is an apocalyptic number.

It is an amenable number.

21433304 is a deficient number, since it is larger than the sum of its proper divisors (18754156).

21433304 is a wasteful number, since it uses less digits than its factorization.

21433304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679169 (or 2679165 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 21433304 is about 4629.6116467799. The cubic root of 21433304 is about 277.7770584633. Note that the first 3 decimals are identical.

Adding to 21433304 its reverse (40333412), we get a palindrome (61766716).

The spelling of 21433304 in words is "twenty-one million, four hundred thirty-three thousand, three hundred four".