21434204 has 24 divisors (see below), whose sum is σ = 43075200. Its totient is φ = 9229680.

The previous prime is 21434177. The next prime is 21434213. The reversal of 21434204 is 40243412.

It is a super-2 number, since 2×21434204² = 918850202227232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11984 + ... + 13655.

It is an arithmetic number, because the mean of its divisors is an integer number (1794800).

Almost surely, 2^21434204 is an apocalyptic number.

It is an amenable number.

21434204 is an abundant number, since it is smaller than the sum of its proper divisors (21640996).

21434204 is a wasteful number, since it uses less digits than its factorization.

21434204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25673 (or 25671 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 21434204 is about 4629.7088461371. The cubic root of 21434204 is about 277.7809464290.

Adding to 21434204 its reverse (40243412), we get a palindrome (61677616).

The spelling of 21434204 in words is "twenty-one million, four hundred thirty-four thousand, two hundred four".