2121445 has 16 divisors (see below), whose sum is σ = 2715840. Its totient is φ = 1586304.

The previous prime is 2121443. The next prime is 2121461. The reversal of 2121445 is 5441212.

2121445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2121445 - 2¹ = 2121443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12934 + ... + 13096.

It is an arithmetic number, because the mean of its divisors is an integer number (169740).

2^2121445 is an apocalyptic number.

It is an amenable number.

2121445 is a deficient number, since it is larger than the sum of its proper divisors (594395).

2121445 is a wasteful number, since it uses less digits than its factorization.

2121445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324.

The product of its digits is 320, while the sum is 19.

The square root of 2121445 is about 1456.5181083667. The cubic root of 2121445 is about 128.4923461353.

Adding to 2121445 its reverse (5441212), we get a palindrome (7562657).

The spelling of 2121445 in words is "two million, one hundred twenty-one thousand, four hundred forty-five".