21105333434 has 8 divisors (see below), whose sum is σ = 33520235508. Its totient is φ = 9931921600.

The previous prime is 21105333433. The next prime is 21105333511. The reversal of 21105333434 is 43433350112.

It can be written as a sum of positive squares in 2 ways, for example, as 21069393409 + 35940025 = 145153^2 + 5995^2 .

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 = 21105333397 and 21105333406.

It is not an unprimeable number, because it can be changed into a prime (21105333433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310372517 + ... + 310372584.

Almost surely, 2^21105333434 is an apocalyptic number.

21105333434 is a deficient number, since it is larger than the sum of its proper divisors (12414902074).

21105333434 is a wasteful number, since it uses less digits than its factorization.

21105333434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620745120.

The product of its (nonzero) digits is 12960, while the sum is 29.

Adding to 21105333434 its reverse (43433350112), we get a palindrome (64538683546).

The spelling of 21105333434 in words is "twenty-one billion, one hundred five million, three hundred thirty-three thousand, four hundred thirty-four".