2121345 has 48 divisors (see below), whose sum is σ = 4043520.
Its totient is φ = 1024512.
The previous prime is 2121341. The next prime is 2121367. The reversal of 2121345 is 5431212.
2121345 is nontrivially palindromic in base 2.
It is not a de Polignac number, because 2121345 - 22 = 2121341 is a prime.
It is not an unprimeable number, because it can be changed into a prime (2121341) by changing a digit.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35926 + ... + 35984.
It is an arithmetic number, because the mean of its divisors is an integer number (84240).
22121345 is an apocalyptic number.
It is an amenable number.
2121345 is a deficient number, since it is larger than the sum of its proper divisors (1922175).
2121345 is a wasteful number, since it uses less digits than its factorization.
2121345 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 134 (or 131 counting only the distinct ones).
The product of its digits is 240, while the sum is 18.
The square root of 2121345 is about 1456.4837795183.
The cubic root of 2121345 is about 128.4903271598.
Adding to 2121345 its reverse (5431212), we get a palindrome (7552557).
The spelling of 2121345 in words is "two million, one hundred twenty-one thousand, three hundred forty-five".