21131616135 has 32 divisors (see below), whose sum is σ = 38654853120. Its totient is φ = 9656621568.

The previous prime is 21131616133. The next prime is 21131616173. The reversal of 21131616135 is 53161613112.

It is not a de Polignac number, because 21131616135 - 2¹ = 21131616133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131616133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 261946 + ... + 332984.

It is an arithmetic number, because the mean of its divisors is an integer number (1207964160).

Almost surely, 2^21131616135 is an apocalyptic number.

21131616135 is a deficient number, since it is larger than the sum of its proper divisors (17523236985).

21131616135 is a wasteful number, since it uses less digits than its factorization.

21131616135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73887.

The product of its digits is 3240, while the sum is 30.

The spelling of 21131616135 in words is "twenty-one billion, one hundred thirty-one million, six hundred sixteen thousand, one hundred thirty-five".