21111313321 has 24 divisors (see below), whose sum is σ = 25401527424. Its totient is φ = 17482489920.

The previous prime is 21111313297. The next prime is 21111313361. The reversal of 21111313321 is 12331311112.

It is not a de Polignac number, because 21111313321 - 2³³ = 12521378729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111313361) 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 23 ways as a sum of consecutive naturals, for example, 155916 + ... + 257938.

It is an arithmetic number, because the mean of its divisors is an integer number (1058396976).

Almost surely, 2^21111313321 is an apocalyptic number.

It is an amenable number.

21111313321 is a deficient number, since it is larger than the sum of its proper divisors (4290214103).

21111313321 is a wasteful number, since it uses less digits than its factorization.

21111313321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102181 (or 102174 counting only the distinct ones).

The product of its digits is 108, while the sum is 19.

Adding to 21111313321 its reverse (12331311112), we get a palindrome (33442624433).

The spelling of 21111313321 in words is "twenty-one billion, one hundred eleven million, three hundred thirteen thousand, three hundred twenty-one".