128921227 has 2 divisors, whose sum is σ = 128921228. Its totient is φ = 128921226.

The previous prime is 128921203. The next prime is 128921231. The reversal of 128921227 is 722129821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128921227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128921192 and 128921201.

It is not a weakly prime, because it can be changed into another prime (128921237) 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, 64460613 + 64460614.

It is an arithmetic number, because the mean of its divisors is an integer number (64460614).

Almost surely, 2^128921227 is an apocalyptic number.

128921227 is a deficient number, since it is larger than the sum of its proper divisors (1).

128921227 is an equidigital number, since it uses as much as digits as its factorization.

128921227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 34.

The square root of 128921227 is about 11354.3483740812. The cubic root of 128921227 is about 505.1745656672.

The spelling of 128921227 in words is "one hundred twenty-eight million, nine hundred twenty-one thousand, two hundred twenty-seven".