21135025322 has 4 divisors (see below), whose sum is σ = 31702537986. Its totient is φ = 10567512660.

The previous prime is 21135025321. The next prime is 21135025349. The reversal of 21135025322 is 22352053112.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 18392513161 + 2742512161 = 135619^2 + 52369^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21135025291 and 21135025300.

It is not an unprimeable number, because it can be changed into a prime (21135025321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5283756329 + ... + 5283756332.

Almost surely, 2^21135025322 is an apocalyptic number.

21135025322 is a deficient number, since it is larger than the sum of its proper divisors (10567512664).

21135025322 is a wasteful number, since it uses less digits than its factorization.

21135025322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10567512663.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21135025322 its reverse (22352053112), we get a palindrome (43487078434).

The spelling of 21135025322 in words is "twenty-one billion, one hundred thirty-five million, twenty-five thousand, three hundred twenty-two".