2154321 has 12 divisors (see below), whose sum is σ = 3351348. Its totient is φ = 1325664.

The previous prime is 2154319. The next prime is 2154329. The reversal of 2154321 is 1234512.

2154321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 435600 + 1718721 = 660^2 + 1311^2 .

It is not a de Polignac number, because 2154321 - 2¹ = 2154319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2154294 and 2154303.

It is not an unprimeable number, because it can be changed into a prime (2154329) 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 11 ways as a sum of consecutive naturals, for example, 9090 + ... + 9323.

It is an arithmetic number, because the mean of its divisors is an integer number (279279).

2^2154321 is an apocalyptic number.

It is an amenable number.

2154321 is a deficient number, since it is larger than the sum of its proper divisors (1197027).

2154321 is a wasteful number, since it uses less digits than its factorization.

2154321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18432 (or 18429 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 2154321 is about 1467.7605390526. The cubic root of 2154321 is about 129.1526946154.

Adding to 2154321 its reverse (1234512), we get a palindrome (3388833).

The spelling of 2154321 in words is "two million, one hundred fifty-four thousand, three hundred twenty-one".