21311303121 has 32 divisors (see below), whose sum is σ = 33385712640. Its totient is φ = 13413859200.

The previous prime is 21311303113. The next prime is 21311303137. The reversal of 21311303121 is 12130311312.

It is not a de Polignac number, because 21311303121 - 2³ = 21311303113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21311303094 and 21311303103.

It is not an unprimeable number, because it can be changed into a prime (21311303141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 276190 + ... + 344823.

It is an arithmetic number, because the mean of its divisors is an integer number (1043303520).

Almost surely, 2^21311303121 is an apocalyptic number.

It is an amenable number.

21311303121 is a deficient number, since it is larger than the sum of its proper divisors (12074409519).

21311303121 is a wasteful number, since it uses less digits than its factorization.

21311303121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621094 (or 621088 counting only the distinct ones).

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

Adding to 21311303121 its reverse (12130311312), we get a palindrome (33441614433).

The spelling of 21311303121 in words is "twenty-one billion, three hundred eleven million, three hundred three thousand, one hundred twenty-one".