21010585251899 has 2 divisors, whose sum is σ = 21010585251900. Its totient is φ = 21010585251898.

The previous prime is 21010585251883. The next prime is 21010585251947. The reversal of 21010585251899 is 99815258501012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010585251899 - 2⁴ = 21010585251883 is a prime.

It is a super-3 number, since 3×21010585251899³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21010585251829) 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, 10505292625949 + 10505292625950.

It is an arithmetic number, because the mean of its divisors is an integer number (10505292625950).

Almost surely, 2^{21010585251899} is an apocalyptic number.

21010585251899 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010585251899 is an equidigital number, since it uses as much as digits as its factorization.

21010585251899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592000, while the sum is 56.

The spelling of 21010585251899 in words is "twenty-one trillion, ten billion, five hundred eighty-five million, two hundred fifty-one thousand, eight hundred ninety-nine".