2155221355 has 16 divisors (see below), whose sum is σ = 2965374720. Its totient is φ = 1473044832.

The previous prime is 2155221353. The next prime is 2155221403. The reversal of 2155221355 is 5531225512.

It is not a de Polignac number, because 2155221355 - 2¹ = 2155221353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2155221353) 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 15 ways as a sum of consecutive naturals, for example, 89545 + ... + 111034.

It is an arithmetic number, because the mean of its divisors is an integer number (185335920).

Almost surely, 2^2155221355 is an apocalyptic number.

2155221355 is a deficient number, since it is larger than the sum of its proper divisors (810153365).

2155221355 is a wasteful number, since it uses less digits than its factorization.

2155221355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200898.

The product of its digits is 15000, while the sum is 31.

The square root of 2155221355 is about 46424.3616542005. The cubic root of 2155221355 is about 1291.7068436387.

Adding to 2155221355 its reverse (5531225512), we get a palindrome (7686446867).

The spelling of 2155221355 in words is "two billion, one hundred fifty-five million, two hundred twenty-one thousand, three hundred fifty-five".