189021211 has 2 divisors, whose sum is σ = 189021212. Its totient is φ = 189021210.

The previous prime is 189021143. The next prime is 189021233. The reversal of 189021211 is 112120981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189021211 - 2⁷ = 189021083 is a prime.

It is not a weakly prime, because it can be changed into another prime (189021611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94510605 + 94510606.

It is an arithmetic number, because the mean of its divisors is an integer number (94510606).

Almost surely, 2^189021211 is an apocalyptic number.

189021211 is a deficient number, since it is larger than the sum of its proper divisors (1).

189021211 is an equidigital number, since it uses as much as digits as its factorization.

189021211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 189021211 is about 13748.4984998363. The cubic root of 189021211 is about 573.9008223796.

The spelling of 189021211 in words is "one hundred eighty-nine million, twenty-one thousand, two hundred eleven".