21210010189 has 2 divisors, whose sum is σ = 21210010190. Its totient is φ = 21210010188.

The previous prime is 21210010177. The next prime is 21210010207. The reversal of 21210010189 is 98101001212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19698122500 + 1511887689 = 140350^2 + 38883^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210010189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210010889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605005094 + 10605005095.

It is an arithmetic number, because the mean of its divisors is an integer number (10605005095).

Almost surely, 2^21210010189 is an apocalyptic number.

It is an amenable number.

21210010189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210010189 is an equidigital number, since it uses as much as digits as its factorization.

21210010189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 21210010189 in words is "twenty-one billion, two hundred ten million, ten thousand, one hundred eighty-nine".