21115322320331 has 4 divisors (see below), whose sum is σ = 21324384917664. Its totient is φ = 20906259723000.

The previous prime is 21115322320247. The next prime is 21115322320387. The reversal of 21115322320331 is 13302322351112.

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 21115322320331 - 2²⁶ = 21115255211467 is a prime.

It is a super-2 number, since 2×21115322320331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21115322320294 and 21115322320303.

It is not an unprimeable number, because it can be changed into a prime (21115322320831) 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, 104531298515 + ... + 104531298716.

It is an arithmetic number, because the mean of its divisors is an integer number (5331096229416).

Almost surely, 2^{21115322320331} is an apocalyptic number.

21115322320331 is a deficient number, since it is larger than the sum of its proper divisors (209062597333).

21115322320331 is a wasteful number, since it uses less digits than its factorization.

21115322320331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209062597332.

The product of its (nonzero) digits is 6480, while the sum is 29.

Adding to 21115322320331 its reverse (13302322351112), we get a palindrome (34417644671443).

The spelling of 21115322320331 in words is "twenty-one trillion, one hundred fifteen billion, three hundred twenty-two million, three hundred twenty thousand, three hundred thirty-one".