2121285 has 16 divisors (see below), whose sum is σ = 3429504. Its totient is φ = 1119552.

The previous prime is 2121271. The next prime is 2121289. The reversal of 2121285 is 5821212.

It is a happy number.

It is not a de Polignac number, because 2121285 - 2⁵ = 2121253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 859 + ... + 2231.

It is an arithmetic number, because the mean of its divisors is an integer number (214344).

2^2121285 is an apocalyptic number.

It is an amenable number.

2121285 is a deficient number, since it is larger than the sum of its proper divisors (1308219).

2121285 is a wasteful number, since it uses less digits than its factorization.

2121285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484.

The product of its digits is 320, while the sum is 21.

The square root of 2121285 is about 1456.4631818209. The cubic root of 2121285 is about 128.4891157440.

Adding to 2121285 its reverse (5821212), we get a palindrome (7942497).

It can be divided in two parts, 21 and 21285, that multiplied together give a triangular number (446985 = T₉₄₅).

The spelling of 2121285 in words is "two million, one hundred twenty-one thousand, two hundred eighty-five".