21231120303 has 8 divisors (see below), whose sum is σ = 31453511600. Its totient is φ = 14154080184.

The previous prime is 21231120271. The next prime is 21231120307. The reversal of 21231120303 is 30302113212.

21231120303 is a `hidden beast` number, since 212 + 31 + 120 + 303 = 666.

It is not a de Polignac number, because 21231120303 - 2⁵ = 21231120271 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 (21231120307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393168868 + ... + 393168921.

It is an arithmetic number, because the mean of its divisors is an integer number (3931688950).

Almost surely, 2^21231120303 is an apocalyptic number.

21231120303 is a deficient number, since it is larger than the sum of its proper divisors (10222391297).

21231120303 is an equidigital number, since it uses as much as digits as its factorization.

21231120303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786337798 (or 786337792 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21231120303 its reverse (30302113212), we get a palindrome (51533233515).

The spelling of 21231120303 in words is "twenty-one billion, two hundred thirty-one million, one hundred twenty thousand, three hundred three".