21135004422 has 32 divisors (see below), whose sum is σ = 48423916800. Its totient is φ = 6024155808.

The previous prime is 21135004421. The next prime is 21135004441. The reversal of 21135004422 is 22440053112.

It is a junction number, because it is equal to n+sod(n) for n = 21135004392 and 21135004401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21135004421) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 582897 + ... + 618092.

It is an arithmetic number, because the mean of its divisors is an integer number (1513247400).

Almost surely, 2^21135004422 is an apocalyptic number.

21135004422 is an abundant number, since it is smaller than the sum of its proper divisors (27288912378).

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

21135004422 is a wasteful number, since it uses less digits than its factorization.

21135004422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201420.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21135004422 its reverse (22440053112), we get a palindrome (43575057534).

The spelling of 21135004422 in words is "twenty-one billion, one hundred thirty-five million, four thousand, four hundred twenty-two".