21003113431303 has 4 divisors (see below), whose sum is σ = 21154214966920. Its totient is φ = 20852011895688.

The previous prime is 21003113431301. The next prime is 21003113431309. The reversal of 21003113431303 is 30313431130012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21003113431303 - 2¹ = 21003113431301 is a prime.

It is a super-2 number, since 2×21003113431303² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003113431301) 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 3 ways as a sum of consecutive naturals, for example, 75550767600 + ... + 75550767877.

It is an arithmetic number, because the mean of its divisors is an integer number (5288553741730).

Almost surely, 2^{21003113431303} is an apocalyptic number.

21003113431303 is a deficient number, since it is larger than the sum of its proper divisors (151101535617).

21003113431303 is a wasteful number, since it uses less digits than its factorization.

21003113431303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151101535616.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 21003113431303 its reverse (30313431130012), we get a palindrome (51316544561315).

The spelling of 21003113431303 in words is "twenty-one trillion, three billion, one hundred thirteen million, four hundred thirty-one thousand, three hundred three".