21043412422 has 4 divisors (see below), whose sum is σ = 31565118636. Its totient is φ = 10521706210.

The previous prime is 21043412393. The next prime is 21043412441. The reversal of 21043412422 is 22421434012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5260853104 + ... + 5260853107.

It is an arithmetic number, because the mean of its divisors is an integer number (7891279659).

Almost surely, 2^21043412422 is an apocalyptic number.

21043412422 is a deficient number, since it is larger than the sum of its proper divisors (10521706214).

21043412422 is a wasteful number, since it uses less digits than its factorization.

21043412422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10521706213.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21043412422 its reverse (22421434012), we get a palindrome (43464846434).

The spelling of 21043412422 in words is "twenty-one billion, forty-three million, four hundred twelve thousand, four hundred twenty-two".