210002121209989 has 2 divisors, whose sum is σ = 210002121209990. Its totient is φ = 210002121209988.

The previous prime is 210002121209941. The next prime is 210002121210029. The reversal of 210002121209989 is 989902121200012.

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., 159523341365025 + 50478779844964 = 12630255^2 + 7104842^2 .

It is a cyclic number.

It is not a de Polignac number, because 210002121209989 - 2¹³ = 210002121201797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210002121209389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105001060604994 + 105001060604995.

It is an arithmetic number, because the mean of its divisors is an integer number (105001060604995).

Almost surely, 2^{210002121209989} is an apocalyptic number.

It is an amenable number.

210002121209989 is a deficient number, since it is larger than the sum of its proper divisors (1).

210002121209989 is an equidigital number, since it uses as much as digits as its factorization.

210002121209989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 46.

The spelling of 210002121209989 in words is "two hundred ten trillion, two billion, one hundred twenty-one million, two hundred nine thousand, nine hundred eighty-nine".