2121289 has 2 divisors, whose sum is σ = 2121290. Its totient is φ = 2121288.

The previous prime is 2121271. The next prime is 2121323. The reversal of 2121289 is 9821212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1863225 + 258064 = 1365^2 + 508^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121289 - 2²¹ = 24137 is a prime.

2121289 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2121239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060644 + 1060645.

It is an arithmetic number, because the mean of its divisors is an integer number (1060645).

2^2121289 is an apocalyptic number.

It is an amenable number.

2121289 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121289 is an equidigital number, since it uses as much as digits as its factorization.

2121289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

The square root of 2121289 is about 1456.4645550098. The cubic root of 2121289 is about 128.4891965058.

The spelling of 2121289 in words is "two million, one hundred twenty-one thousand, two hundred eighty-nine".