2121291 has 6 divisors (see below), whose sum is σ = 3064100. Its totient is φ = 1414188.

The previous prime is 2121289. The next prime is 2121323. The reversal of 2121291 is 1921212.

It is not a de Polignac number, because 2121291 - 2¹ = 2121289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117841 + ... + 117858.

2^2121291 is an apocalyptic number.

2121291 is a deficient number, since it is larger than the sum of its proper divisors (942809).

2121291 is a wasteful number, since it uses less digits than its factorization.

2121291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235705 (or 235702 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 2121291 is about 1456.4652416038. The cubic root of 2121291 is about 128.4892368866.

It can be divided in two parts, 21 and 21291, that added together give a palindrome (21312).

The spelling of 2121291 in words is "two million, one hundred twenty-one thousand, two hundred ninety-one".