128921203 has 2 divisors, whose sum is σ = 128921204. Its totient is φ = 128921202.

The previous prime is 128921201. The next prime is 128921227. The reversal of 128921203 is 302129821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128921203 - 2¹ = 128921201 is a prime.

Together with 128921201, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (128921201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64460601 + 64460602.

It is an arithmetic number, because the mean of its divisors is an integer number (64460602).

Almost surely, 2^128921203 is an apocalyptic number.

128921203 is a deficient number, since it is larger than the sum of its proper divisors (1).

128921203 is an equidigital number, since it uses as much as digits as its factorization.

128921203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 128921203 is about 11354.3473172173. The cubic root of 128921203 is about 505.1745343194.

The spelling of 128921203 in words is "one hundred twenty-eight million, nine hundred twenty-one thousand, two hundred three".