16821212135 has 32 divisors (see below), whose sum is σ = 25515111552. Its totient is φ = 10359498240.

The previous prime is 16821212119. The next prime is 16821212153. The reversal of 16821212135 is 53121212861.

It is not a de Polignac number, because 16821212135 - 2⁴ = 16821212119 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 482756 + ... + 516425.

It is an arithmetic number, because the mean of its divisors is an integer number (797347236).

Almost surely, 2^16821212135 is an apocalyptic number.

16821212135 is a deficient number, since it is larger than the sum of its proper divisors (8693899417).

16821212135 is a wasteful number, since it uses less digits than its factorization.

16821212135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999243.

The product of its digits is 5760, while the sum is 32.

Adding to 16821212135 its reverse (53121212861), we get a palindrome (69942424996).

The spelling of 16821212135 in words is "sixteen billion, eight hundred twenty-one million, two hundred twelve thousand, one hundred thirty-five".