21213405331234 has 16 divisors (see below), whose sum is σ = 32754719237688. Its totient is φ = 10299291904512.

The previous prime is 21213405331231. The next prime is 21213405331333. The reversal of 21213405331234 is 43213350431212.

It can be written as a sum of positive squares in 4 ways, for example, as 21199550864209 + 13854467025 = 4604297^2 + 117705^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21213405331234.

It is not an unprimeable number, because it can be changed into a prime (21213405331231) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1031569437 + ... + 1031590000.

Almost surely, 2^{21213405331234} is an apocalyptic number.

21213405331234 is a deficient number, since it is larger than the sum of its proper divisors (11541313906454).

21213405331234 is a wasteful number, since it uses less digits than its factorization.

21213405331234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063159589.

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 21213405331234 its reverse (43213350431212), we get a palindrome (64426755762446).

The spelling of 21213405331234 in words is "twenty-one trillion, two hundred thirteen billion, four hundred five million, three hundred thirty-one thousand, two hundred thirty-four".