21131111212327 has 2 divisors, whose sum is σ = 21131111212328. Its totient is φ = 21131111212326.

The previous prime is 21131111212303. The next prime is 21131111212363. The reversal of 21131111212327 is 72321211113112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21131111212327 - 2²⁷ = 21130976994599 is a prime.

It is a super-2 number, since 2×21131111212327² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21131111212295 and 21131111212304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21131111212927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565555606163 + 10565555606164.

It is an arithmetic number, because the mean of its divisors is an integer number (10565555606164).

Almost surely, 2^{21131111212327} is an apocalyptic number.

21131111212327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131111212327 is an equidigital number, since it uses as much as digits as its factorization.

21131111212327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 28.

Adding to 21131111212327 its reverse (72321211113112), we get a palindrome (93452322325439).

The spelling of 21131111212327 in words is "twenty-one trillion, one hundred thirty-one billion, one hundred eleven million, two hundred twelve thousand, three hundred twenty-seven".