2155150321 has 2 divisors, whose sum is σ = 2155150322. Its totient is φ = 2155150320.

The previous prime is 2155150307. The next prime is 2155150339. The reversal of 2155150321 is 1230515512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1624493025 + 530657296 = 40305^2 + 23036^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155150321 - 2¹⁵ = 2155117553 is a prime.

It is a super-2 number, since 2×2155150321² = 9289345812212806082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2155150391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077575160 + 1077575161.

It is an arithmetic number, because the mean of its divisors is an integer number (1077575161).

Almost surely, 2^2155150321 is an apocalyptic number.

It is an amenable number.

2155150321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155150321 is an equidigital number, since it uses as much as digits as its factorization.

2155150321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 2155150321 is about 46423.5965969893. The cubic root of 2155150321 is about 1291.6926523490.

Adding to 2155150321 its reverse (1230515512), we get a palindrome (3385665833).

The spelling of 2155150321 in words is "two billion, one hundred fifty-five million, one hundred fifty thousand, three hundred twenty-one".