2153221 has 8 divisors (see below), whose sum is σ = 2545920. Its totient is φ = 1781808.

The previous prime is 2153209. The next prime is 2153227. The reversal of 2153221 is 1223512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2153221 - 2¹⁵ = 2120453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2153195 and 2153204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2153227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5101 + ... + 5506.

It is an arithmetic number, because the mean of its divisors is an integer number (318240).

2^2153221 is an apocalyptic number.

It is an amenable number.

2153221 is a deficient number, since it is larger than the sum of its proper divisors (392699).

2153221 is a wasteful number, since it uses less digits than its factorization.

2153221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10643.

The product of its digits is 120, while the sum is 16.

The square root of 2153221 is about 1467.3857706820. The cubic root of 2153221 is about 129.1307090105.

Adding to 2153221 its reverse (1223512), we get a palindrome (3376733).

The spelling of 2153221 in words is "two million, one hundred fifty-three thousand, two hundred twenty-one".