21113231303 has 4 divisors (see below), whose sum is σ = 21121608768. Its totient is φ = 21104853840.

The previous prime is 21113231273. The next prime is 21113231341. The reversal of 21113231303 is 30313231112.

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 21113231303 - 2⁶ = 21113231239 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 (21113231203) 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, 4184951 + ... + 4189992.

It is an arithmetic number, because the mean of its divisors is an integer number (5280402192).

Almost surely, 2^21113231303 is an apocalyptic number.

21113231303 is a deficient number, since it is larger than the sum of its proper divisors (8377465).

21113231303 is an equidigital number, since it uses as much as digits as its factorization.

21113231303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8377464.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21113231303 its reverse (30313231112), we get a palindrome (51426462415).

The spelling of 21113231303 in words is "twenty-one billion, one hundred thirteen million, two hundred thirty-one thousand, three hundred three".