21004024234 has 8 divisors (see below), whose sum is σ = 32274476388. Its totient is φ = 10245865440.

The previous prime is 21004024211. The next prime is 21004024243. The reversal of 21004024234 is 43242040012.

It is a happy number.

21004024234 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 20922176025 + 81848209 = 144645^2 + 9047^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128073237 + ... + 128073400.

Almost surely, 2^21004024234 is an apocalyptic number.

21004024234 is a deficient number, since it is larger than the sum of its proper divisors (11270452154).

21004024234 is a wasteful number, since it uses less digits than its factorization.

21004024234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256146680.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21004024234 its reverse (43242040012), we get a palindrome (64246064246).

The spelling of 21004024234 in words is "twenty-one billion, four million, twenty-four thousand, two hundred thirty-four".