2151404321 has 12 divisors (see below), whose sum is σ = 2366023716. Its totient is φ = 1954782720.

The previous prime is 2151404317. The next prime is 2151404347. The reversal of 2151404321 is 1234041512.

It can be written as a sum of positive squares in 2 ways, for example, as 472453696 + 1678950625 = 21736^2 + 40975^2 .

It is not a de Polignac number, because 2151404321 - 2² = 2151404317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151401321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310325 + ... + 317181.

It is an arithmetic number, because the mean of its divisors is an integer number (197168643).

Almost surely, 2^2151404321 is an apocalyptic number.

It is an amenable number.

2151404321 is a deficient number, since it is larger than the sum of its proper divisors (214619395).

2151404321 is a wasteful number, since it uses less digits than its factorization.

2151404321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9472 (or 9461 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 2151404321 is about 46383.2331882977. The cubic root of 2151404321 is about 1290.9438280390.

Adding to 2151404321 its reverse (1234041512), we get a palindrome (3385445833).

The spelling of 2151404321 in words is "two billion, one hundred fifty-one million, four hundred four thousand, three hundred twenty-one".