21303203135515 has 32 divisors (see below), whose sum is σ = 29829376120320. Its totient is φ = 14303106240000.

The previous prime is 21303203135479. The next prime is 21303203135537. The reversal of 21303203135515 is 51553130230312.

It is not a de Polignac number, because 21303203135515 - 2²⁹ = 21302666264603 is a prime.

It is a super-2 number, since 2×21303203135515² (a number of 27 digits) contains 22 as substring.

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 in 31 ways as a sum of consecutive naturals, for example, 20032126 + ... + 21068755.

It is an arithmetic number, because the mean of its divisors is an integer number (932168003760).

Almost surely, 2^{21303203135515} is an apocalyptic number.

21303203135515 is a deficient number, since it is larger than the sum of its proper divisors (8526172984805).

21303203135515 is a wasteful number, since it uses less digits than its factorization.

21303203135515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41101203.

The product of its (nonzero) digits is 40500, while the sum is 34.

Adding to 21303203135515 its reverse (51553130230312), we get a palindrome (72856333365827).

The spelling of 21303203135515 in words is "twenty-one trillion, three hundred three billion, two hundred three million, one hundred thirty-five thousand, five hundred fifteen".