210121489 has 2 divisors, whose sum is σ = 210121490. Its totient is φ = 210121488.

The previous prime is 210121481. The next prime is 210121517. The reversal of 210121489 is 984121012.

It is an a-pointer prime, because the next prime (210121517) can be obtained adding 210121489 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143209089 + 66912400 = 11967^2 + 8180^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121489 - 2³ = 210121481 is a prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (210121481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060744 + 105060745.

It is an arithmetic number, because the mean of its divisors is an integer number (105060745).

Almost surely, 2^210121489 is an apocalyptic number.

It is an amenable number.

210121489 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121489 is an equidigital number, since it uses as much as digits as its factorization.

210121489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 210121489 is about 14495.5679088472. The cubic root of 210121489 is about 594.5067955819.

The spelling of 210121489 in words is "two hundred ten million, one hundred twenty-one thousand, four hundred eighty-nine".