2221189771 has 2 divisors, whose sum is σ = 2221189772. Its totient is φ = 2221189770.

The previous prime is 2221189727. The next prime is 2221189777. The reversal of 2221189771 is 1779811222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2221189771 - 2⁹ = 2221189259 is a prime.

It is the 47130-th Hogben number.

It is not a weakly prime, because it can be changed into another prime (2221189777) by changing a digit.

It is a nontrivial repunit in base 47129.

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, 1110594885 + 1110594886.

It is an arithmetic number, because the mean of its divisors is an integer number (1110594886).

Almost surely, 2^2221189771 is an apocalyptic number.

2221189771 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221189771 is an equidigital number, since it uses as much as digits as its factorization.

2221189771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 40.

The square root of 2221189771 is about 47129.5000079568. The cubic root of 2221189771 is about 1304.7537535894.

The spelling of 2221189771 in words is "two billion, two hundred twenty-one million, one hundred eighty-nine thousand, seven hundred seventy-one".