21112241687 has 2 divisors, whose sum is σ = 21112241688. Its totient is φ = 21112241686.

The previous prime is 21112241681. The next prime is 21112241713. The reversal of 21112241687 is 78614221112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21112241687 - 2¹² = 21112237591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112241681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556120843 + 10556120844.

It is an arithmetic number, because the mean of its divisors is an integer number (10556120844).

Almost surely, 2^21112241687 is an apocalyptic number.

21112241687 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112241687 is an equidigital number, since it uses as much as digits as its factorization.

21112241687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 35.

Adding to 21112241687 its reverse (78614221112), we get a palindrome (99726462799).

The spelling of 21112241687 in words is "twenty-one billion, one hundred twelve million, two hundred forty-one thousand, six hundred eighty-seven".