21143320422 has 256 divisors, whose sum is σ = 54083635200. Its totient is φ = 5376983040.

The previous prime is 21143320421. The next prime is 21143320433. The reversal of 21143320422 is 22402334112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21143320392 and 21143320401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143320421) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 154330738 + ... + 154330874.

It is an arithmetic number, because the mean of its divisors is an integer number (211264200).

Almost surely, 2^21143320422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21143320422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27041817600).

21143320422 is an abundant number, since it is smaller than the sum of its proper divisors (32940314778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21143320422 is a wasteful number, since it uses less digits than its factorization.

21143320422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21143320422 its reverse (22402334112), we get a palindrome (43545654534).

The spelling of 21143320422 in words is "twenty-one billion, one hundred forty-three million, three hundred twenty thousand, four hundred twenty-two".