21533330234 has 8 divisors (see below), whose sum is σ = 34784610420. Its totient is φ = 9938460096.

The previous prime is 21533330219. The next prime is 21533330243. The reversal of 21533330234 is 43203333512.

It can be written as a sum of positive squares in 2 ways, for example, as 21125169025 + 408161209 = 145345^2 + 20203^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21533330197 and 21533330206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 414102479 + ... + 414102530.

Almost surely, 2^21533330234 is an apocalyptic number.

21533330234 is a deficient number, since it is larger than the sum of its proper divisors (13251280186).

21533330234 is a wasteful number, since it uses less digits than its factorization.

21533330234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828205024.

The product of its (nonzero) digits is 19440, while the sum is 29.

Adding to 21533330234 its reverse (43203333512), we get a palindrome (64736663746).

The spelling of 21533330234 in words is "twenty-one billion, five hundred thirty-three million, three hundred thirty thousand, two hundred thirty-four".