2151232321 has 16 divisors (see below), whose sum is σ = 2599769088. Its totient is φ = 1740902400.

The previous prime is 2151232313. The next prime is 2151232327. The reversal of 2151232321 is 1232321512.

It is a cyclic number.

It is not a de Polignac number, because 2151232321 - 2³ = 2151232313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2151232292 and 2151232301.

It is not an unprimeable number, because it can be changed into a prime (2151232327) 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, 112000 + ... + 129793.

It is an arithmetic number, because the mean of its divisors is an integer number (162485568).

Almost surely, 2^2151232321 is an apocalyptic number.

It is an amenable number.

2151232321 is a deficient number, since it is larger than the sum of its proper divisors (448536767).

2151232321 is a wasteful number, since it uses less digits than its factorization.

2151232321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241872.

The product of its digits is 720, while the sum is 22.

The square root of 2151232321 is about 46381.3790329697. The cubic root of 2151232321 is about 1290.9094244243.

Adding to 2151232321 its reverse (1232321512), we get a palindrome (3383553833).

The spelling of 2151232321 in words is "two billion, one hundred fifty-one million, two hundred thirty-two thousand, three hundred twenty-one".