210020989 has 2 divisors, whose sum is σ = 210020990. Its totient is φ = 210020988.

The previous prime is 210020963. The next prime is 210021047. The reversal of 210020989 is 989020012.

210020989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113784889 + 96236100 = 10667^2 + 9810^2 .

It is a cyclic number.

It is not a de Polignac number, because 210020989 - 2⁷ = 210020861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210020989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210020189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010494 + 105010495.

It is an arithmetic number, because the mean of its divisors is an integer number (105010495).

Almost surely, 2^210020989 is an apocalyptic number.

It is an amenable number.

210020989 is a deficient number, since it is larger than the sum of its proper divisors (1).

210020989 is an equidigital number, since it uses as much as digits as its factorization.

210020989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 210020989 is about 14492.1009173963. The cubic root of 210020989 is about 594.4119973115.

The spelling of 210020989 in words is "two hundred ten million, twenty thousand, nine hundred eighty-nine".