2132643221 has 4 divisors (see below), whose sum is σ = 2140342572. Its totient is φ = 2124943872.

The previous prime is 2132643181. The next prime is 2132643229. The reversal of 2132643221 is 1223462312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1370110225 + 762532996 = 37015^2 + 27614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2132643221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2132643229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3849260 + ... + 3849813.

It is an arithmetic number, because the mean of its divisors is an integer number (535085643).

Almost surely, 2^2132643221 is an apocalyptic number.

It is an amenable number.

2132643221 is a deficient number, since it is larger than the sum of its proper divisors (7699351).

2132643221 is an equidigital number, since it uses as much as digits as its factorization.

2132643221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7699350.

The product of its digits is 3456, while the sum is 26.

The square root of 2132643221 is about 46180.5502457474. The cubic root of 2132643221 is about 1287.1803528092.

The spelling of 2132643221 in words is "two billion, one hundred thirty-two million, six hundred forty-three thousand, two hundred twenty-one".