21000210109889 has 2 divisors, whose sum is σ = 21000210109890. Its totient is φ = 21000210109888.

The previous prime is 21000210109847. The next prime is 21000210109919. The reversal of 21000210109889 is 98890101200012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14050090239025 + 6950119870864 = 3748345^2 + 2636308^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000210109889 - 2³² = 20995915142593 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000210159889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500105054944 + 10500105054945.

It is an arithmetic number, because the mean of its divisors is an integer number (10500105054945).

Almost surely, 2^{21000210109889} is an apocalyptic number.

It is an amenable number.

21000210109889 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000210109889 is an equidigital number, since it uses as much as digits as its factorization.

21000210109889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 41.

The spelling of 21000210109889 in words is "twenty-one trillion, two hundred ten million, one hundred nine thousand, eight hundred eighty-nine".