2128155427 has 2 divisors, whose sum is σ = 2128155428. Its totient is φ = 2128155426.

The previous prime is 2128155413. The next prime is 2128155443. The reversal of 2128155427 is 7245518212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2128155427 is a prime.

It is not a weakly prime, because it can be changed into another prime (2128153427) 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, 1064077713 + 1064077714.

It is an arithmetic number, because the mean of its divisors is an integer number (1064077714).

Almost surely, 2^2128155427 is an apocalyptic number.

2128155427 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128155427 is an equidigital number, since it uses as much as digits as its factorization.

2128155427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44800, while the sum is 37.

The square root of 2128155427 is about 46131.9350016884. The cubic root of 2128155427 is about 1286.2768328773.

The spelling of 2128155427 in words is "two billion, one hundred twenty-eight million, one hundred fifty-five thousand, four hundred twenty-seven".