21004313135 has 64 divisors (see below), whose sum is σ = 29262643200. Its totient is φ = 14342635008.

The previous prime is 21004313131. The next prime is 21004313147. The reversal of 21004313135 is 53131340012.

It is not a de Polignac number, because 21004313135 - 2² = 21004313131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21004313135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004313131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14595746 + ... + 14597184.

It is an arithmetic number, because the mean of its divisors is an integer number (457228800).

Almost surely, 2^21004313135 is an apocalyptic number.

21004313135 is a deficient number, since it is larger than the sum of its proper divisors (8258330065).

21004313135 is a wasteful number, since it uses less digits than its factorization.

21004313135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 21004313135 its reverse (53131340012), we get a palindrome (74135653147).

The spelling of 21004313135 in words is "twenty-one billion, four million, three hundred thirteen thousand, one hundred thirty-five".