2155218133 has 2 divisors, whose sum is σ = 2155218134. Its totient is φ = 2155218132.

The previous prime is 2155218119. The next prime is 2155218137. The reversal of 2155218133 is 3318125512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1367742289 + 787475844 = 36983^2 + 28062^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155218133 - 2⁵ = 2155218101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2155218095 and 2155218104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155218137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077609066 + 1077609067.

It is an arithmetic number, because the mean of its divisors is an integer number (1077609067).

Almost surely, 2^2155218133 is an apocalyptic number.

It is an amenable number.

2155218133 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155218133 is an equidigital number, since it uses as much as digits as its factorization.

2155218133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 2155218133 is about 46424.3269525795. The cubic root of 2155218133 is about 1291.7061999490.

The spelling of 2155218133 in words is "two billion, one hundred fifty-five million, two hundred eighteen thousand, one hundred thirty-three".