210031209989 has 2 divisors, whose sum is σ = 210031209990. Its totient is φ = 210031209988.

The previous prime is 210031209959. The next prime is 210031210019. The reversal of 210031209989 is 989902130012.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (210031209959) and next prime (210031210019).

It can be written as a sum of positive squares in only one way, i.e., 188718129889 + 21313080100 = 434417^2 + 145990^2 .

It is a cyclic number.

It is not a de Polignac number, because 210031209989 - 2³² = 205736242693 is a prime.

It is a super-2 number, since 2×210031209989² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210031209959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105015604994 + 105015604995.

It is an arithmetic number, because the mean of its divisors is an integer number (105015604995).

Almost surely, 2^210031209989 is an apocalyptic number.

It is an amenable number.

210031209989 is a deficient number, since it is larger than the sum of its proper divisors (1).

210031209989 is an equidigital number, since it uses as much as digits as its factorization.

210031209989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 210031209989 in words is "two hundred ten billion, thirty-one million, two hundred nine thousand, nine hundred eighty-nine".