2155155211 has 16 divisors (see below), whose sum is σ = 2378787840. Its totient is φ = 1936221120.

The previous prime is 2155155187. The next prime is 2155155251. The reversal of 2155155211 is 1125515512.

It is a cyclic number.

It is not a de Polignac number, because 2155155211 - 2¹⁹ = 2154630923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2155155211.

It is not an unprimeable number, because it can be changed into a prime (2155155251) 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, 643006 + ... + 646348.

It is an arithmetic number, because the mean of its divisors is an integer number (148674240).

Almost surely, 2^2155155211 is an apocalyptic number.

2155155211 is a deficient number, since it is larger than the sum of its proper divisors (223632629).

2155155211 is a wasteful number, since it uses less digits than its factorization.

2155155211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4026.

The product of its digits is 2500, while the sum is 28.

The square root of 2155155211 is about 46423.6492641412. The cubic root of 2155155211 is about 1291.6936292913.

The spelling of 2155155211 in words is "two billion, one hundred fifty-five million, one hundred fifty-five thousand, two hundred eleven".