21121311303 has 8 divisors (see below), whose sum is σ = 31290831600. Its totient is φ = 14080874184.

The previous prime is 21121311191. The next prime is 21121311307. The reversal of 21121311303 is 30311312112.

It is not a de Polignac number, because 21121311303 - 2⁸ = 21121311047 is a prime.

It is a super-2 number, since 2×21121311303² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121311307) 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 7 ways as a sum of consecutive naturals, for example, 391135368 + ... + 391135421.

It is an arithmetic number, because the mean of its divisors is an integer number (3911353950).

Almost surely, 2^21121311303 is an apocalyptic number.

21121311303 is a deficient number, since it is larger than the sum of its proper divisors (10169520297).

21121311303 is an equidigital number, since it uses as much as digits as its factorization.

21121311303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782270798 (or 782270792 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21121311303 its reverse (30311312112), we get a palindrome (51432623415).

The spelling of 21121311303 in words is "twenty-one billion, one hundred twenty-one million, three hundred eleven thousand, three hundred three".