21321233422 has 4 divisors (see below), whose sum is σ = 31981850136. Its totient is φ = 10660616710.

The previous prime is 21321233399. The next prime is 21321233429. The reversal of 21321233422 is 22433212312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321233429) by changing a digit.

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, 5330308354 + ... + 5330308357.

It is an arithmetic number, because the mean of its divisors is an integer number (7995462534).

Almost surely, 2^21321233422 is an apocalyptic number.

21321233422 is a deficient number, since it is larger than the sum of its proper divisors (10660616714).

21321233422 is a wasteful number, since it uses less digits than its factorization.

21321233422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10660616713.

The product of its digits is 3456, while the sum is 25.

Adding to 21321233422 its reverse (22433212312), we get a palindrome (43754445734).

The spelling of 21321233422 in words is "twenty-one billion, three hundred twenty-one million, two hundred thirty-three thousand, four hundred twenty-two".