210001121001689 has 2 divisors, whose sum is σ = 210001121001690. Its totient is φ = 210001121001688.

The previous prime is 210001121001671. The next prime is 210001121001739. The reversal of 210001121001689 is 986100121100012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209723110512400 + 278010489289 = 14481820^2 + 527267^2 .

It is a cyclic number.

It is not a de Polignac number, because 210001121001689 - 2²⁰ = 210001119953113 is a prime.

It is not a weakly prime, because it can be changed into another prime (210001121003689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105000560500844 + 105000560500845.

It is an arithmetic number, because the mean of its divisors is an integer number (105000560500845).

Almost surely, 2^{210001121001689} is an apocalyptic number.

It is an amenable number.

210001121001689 is a deficient number, since it is larger than the sum of its proper divisors (1).

210001121001689 is an equidigital number, since it uses as much as digits as its factorization.

210001121001689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 32.

The spelling of 210001121001689 in words is "two hundred ten trillion, one billion, one hundred twenty-one million, one thousand, six hundred eighty-nine".