210101209489 has 2 divisors, whose sum is σ = 210101209490. Its totient is φ = 210101209488.

The previous prime is 210101209481. The next prime is 210101209523. The reversal of 210101209489 is 984902101012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198559360000 + 11541849489 = 445600^2 + 107433^2 .

It is a cyclic number.

It is not a de Polignac number, because 210101209489 - 2³ = 210101209481 is a prime.

It is a super-2 number, since 2×210101209489² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (210101209481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105050604744 + 105050604745.

It is an arithmetic number, because the mean of its divisors is an integer number (105050604745).

Almost surely, 2^210101209489 is an apocalyptic number.

It is an amenable number.

210101209489 is a deficient number, since it is larger than the sum of its proper divisors (1).

210101209489 is an equidigital number, since it uses as much as digits as its factorization.

210101209489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 210101209489 in words is "two hundred ten billion, one hundred one million, two hundred nine thousand, four hundred eighty-nine".