21010413887 has 2 divisors, whose sum is σ = 21010413888. Its totient is φ = 21010413886.

The previous prime is 21010413877. The next prime is 21010413913. The reversal of 21010413887 is 78831401012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010413887 - 2⁴ = 21010413871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010413857) 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, 10505206943 + 10505206944.

It is an arithmetic number, because the mean of its divisors is an integer number (10505206944).

Almost surely, 2^21010413887 is an apocalyptic number.

21010413887 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010413887 is an equidigital number, since it uses as much as digits as its factorization.

21010413887 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21010413887 its reverse (78831401012), we get a palindrome (99841814899).

The spelling of 21010413887 in words is "twenty-one billion, ten million, four hundred thirteen thousand, eight hundred eighty-seven".