21031013303 has 4 divisors (see below), whose sum is σ = 22137908760. Its totient is φ = 19924117848.

The previous prime is 21031013291. The next prime is 21031013317. The reversal of 21031013303 is 30331013012.

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 21031013303 - 2⁴ = 21031013287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031013363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553447700 + ... + 553447737.

It is an arithmetic number, because the mean of its divisors is an integer number (5534477190).

Almost surely, 2^21031013303 is an apocalyptic number.

21031013303 is a deficient number, since it is larger than the sum of its proper divisors (1106895457).

21031013303 is a wasteful number, since it uses less digits than its factorization.

21031013303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106895456.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21031013303 its reverse (30331013012), we get a palindrome (51362026315).

The spelling of 21031013303 in words is "twenty-one billion, thirty-one million, thirteen thousand, three hundred three".