2153212221 has 16 divisors (see below), whose sum is σ = 3071599040. Its totient is φ = 1337627520.

The previous prime is 2153212207. The next prime is 2153212289. The reversal of 2153212221 is 1222123512.

It is not a de Polignac number, because 2153212221 - 2⁶ = 2153212157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2153210221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306160 + ... + 313113.

It is an arithmetic number, because the mean of its divisors is an integer number (191974940).

Almost surely, 2^2153212221 is an apocalyptic number.

It is an amenable number.

2153212221 is a deficient number, since it is larger than the sum of its proper divisors (918386819).

2153212221 is a wasteful number, since it uses less digits than its factorization.

2153212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619356.

The product of its digits is 480, while the sum is 21.

The square root of 2153212221 is about 46402.7178191106. The cubic root of 2153212221 is about 1291.3053351528.

Adding to 2153212221 its reverse (1222123512), we get a palindrome (3375335733).

The spelling of 2153212221 in words is "two billion, one hundred fifty-three million, two hundred twelve thousand, two hundred twenty-one".