21222434342 has 4 divisors (see below), whose sum is σ = 31833651516. Its totient is φ = 10611217170.

The previous prime is 21222434339. The next prime is 21222434353. The reversal of 21222434342 is 24343422212.

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 (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305608584 + ... + 5305608587.

It is an arithmetic number, because the mean of its divisors is an integer number (7958412879).

Almost surely, 2^21222434342 is an apocalyptic number.

21222434342 is a deficient number, since it is larger than the sum of its proper divisors (10611217174).

21222434342 is a wasteful number, since it uses less digits than its factorization.

21222434342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611217173.

The product of its digits is 18432, while the sum is 29.

Adding to 21222434342 its reverse (24343422212), we get a palindrome (45565856554).

The spelling of 21222434342 in words is "twenty-one billion, two hundred twenty-two million, four hundred thirty-four thousand, three hundred forty-two".