21530322135 has 24 divisors (see below), whose sum is σ = 42650543520. Its totient is φ = 9842432832.

The previous prime is 21530322133. The next prime is 21530322157. The reversal of 21530322135 is 53122303512.

It is a happy number.

It is not a de Polignac number, because 21530322135 - 2¹ = 21530322133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21530322099 and 21530322108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530322133) 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 in 23 ways as a sum of consecutive naturals, for example, 34174800 + ... + 34175429.

It is an arithmetic number, because the mean of its divisors is an integer number (1777105980).

Almost surely, 2^21530322135 is an apocalyptic number.

21530322135 is a deficient number, since it is larger than the sum of its proper divisors (21120221385).

21530322135 is a wasteful number, since it uses less digits than its factorization.

21530322135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68350247 (or 68350244 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 21530322135 its reverse (53122303512), we get a palindrome (74652625647).

The spelling of 21530322135 in words is "twenty-one billion, five hundred thirty million, three hundred twenty-two thousand, one hundred thirty-five".