2155310321 has 2 divisors, whose sum is σ = 2155310322. Its totient is φ = 2155310320.

The previous prime is 2155310281. The next prime is 2155310341. The reversal of 2155310321 is 1230135512.

It is a happy number.

2155310321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1925454400 + 229855921 = 43880^2 + 15161^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155310321 - 2⁶ = 2155310257 is a prime.

It is not a weakly prime, because it can be changed into another prime (2155310341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077655160 + 1077655161.

It is an arithmetic number, because the mean of its divisors is an integer number (1077655161).

Almost surely, 2^2155310321 is an apocalyptic number.

It is an amenable number.

2155310321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155310321 is an equidigital number, since it uses as much as digits as its factorization.

2155310321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 2155310321 is about 46425.3198265774. The cubic root of 2155310321 is about 1291.7246169732.

Adding to 2155310321 its reverse (1230135512), we get a palindrome (3385445833).

The spelling of 2155310321 in words is "two billion, one hundred fifty-five million, three hundred ten thousand, three hundred twenty-one".