21523321322 has 4 divisors (see below), whose sum is σ = 32284981986. Its totient is φ = 10761660660.

The previous prime is 21523321289. The next prime is 21523321361. The reversal of 21523321322 is 22312332512.

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., 19426505641 + 2096815681 = 139379^2 + 45791^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21523321291 and 21523321300.

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, 5380830329 + ... + 5380830332.

Almost surely, 2^21523321322 is an apocalyptic number.

21523321322 is a deficient number, since it is larger than the sum of its proper divisors (10761660664).

21523321322 is a wasteful number, since it uses less digits than its factorization.

21523321322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10761660663.

The product of its digits is 4320, while the sum is 26.

Adding to 21523321322 its reverse (22312332512), we get a palindrome (43835653834).

The spelling of 21523321322 in words is "twenty-one billion, five hundred twenty-three million, three hundred twenty-one thousand, three hundred twenty-two".