21131132287 has 2 divisors, whose sum is σ = 21131132288. Its totient is φ = 21131132286.

The previous prime is 21131132261. The next prime is 21131132333. The reversal of 21131132287 is 78223113112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21131132287 - 2²³ = 21122743679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21131132887) 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, 10565566143 + 10565566144.

It is an arithmetic number, because the mean of its divisors is an integer number (10565566144).

Almost surely, 2^21131132287 is an apocalyptic number.

21131132287 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131132287 is an equidigital number, since it uses as much as digits as its factorization.

21131132287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

Adding to 21131132287 its reverse (78223113112), we get a palindrome (99354245399).

The spelling of 21131132287 in words is "twenty-one billion, one hundred thirty-one million, one hundred thirty-two thousand, two hundred eighty-seven".