2155577121 has 12 divisors (see below), whose sum is σ = 3179859072. Its totient is φ = 1406475576.

The previous prime is 2155577093. The next prime is 2155577129. The reversal of 2155577121 is 1217755512.

2155577121 is a `hidden beast` number, since 2 + 15 + 557 + 71 + 21 = 666.

2155577121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2155577121 - 2⁷ = 2155576993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2155577129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2547541 + ... + 2548386.

It is an arithmetic number, because the mean of its divisors is an integer number (264988256).

Almost surely, 2^2155577121 is an apocalyptic number.

It is an amenable number.

2155577121 is a deficient number, since it is larger than the sum of its proper divisors (1024281951).

2155577121 is a wasteful number, since it uses less digits than its factorization.

2155577121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5095980 (or 5095977 counting only the distinct ones).

The product of its digits is 24500, while the sum is 36.

The square root of 2155577121 is about 46428.1931696679. The cubic root of 2155577121 is about 1291.7779144659. Note that the first 3 decimals are identical.

The spelling of 2155577121 in words is "two billion, one hundred fifty-five million, five hundred seventy-seven thousand, one hundred twenty-one".