2155543321 has 4 divisors (see below), whose sum is σ = 2155703652. Its totient is φ = 2155382992.

The previous prime is 2155543309. The next prime is 2155543391. The reversal of 2155543321 is 1233455512.

2155543321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 807184921 + 1348358400 = 28411^2 + 36720^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155543321 - 2⁵ = 2155543289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155543391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57946 + ... + 87571.

It is an arithmetic number, because the mean of its divisors is an integer number (538925913).

Almost surely, 2^2155543321 is an apocalyptic number.

It is an amenable number.

2155543321 is a deficient number, since it is larger than the sum of its proper divisors (160331).

2155543321 is a wasteful number, since it uses less digits than its factorization.

2155543321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160330.

The product of its digits is 18000, while the sum is 31.

The square root of 2155543321 is about 46427.8291652754. The cubic root of 2155543321 is about 1291.7711626280.

Adding to 2155543321 its reverse (1233455512), we get a palindrome (3388998833).

The spelling of 2155543321 in words is "two billion, one hundred fifty-five million, five hundred forty-three thousand, three hundred twenty-one".