2221210091 has 2 divisors, whose sum is σ = 2221210092. Its totient is φ = 2221210090.

The previous prime is 2221210087. The next prime is 2221210127. The reversal of 2221210091 is 1900121222.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2221210091 - 2² = 2221210087 is a prime.

It is not a weakly prime, because it can be changed into another prime (2221210031) 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, 1110605045 + 1110605046.

It is an arithmetic number, because the mean of its divisors is an integer number (1110605046).

Almost surely, 2^2221210091 is an apocalyptic number.

2221210091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221210091 is an equidigital number, since it uses as much as digits as its factorization.

2221210091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 2221210091 is about 47129.7155836952. The cubic root of 2221210091 is about 1304.7577323153.

The spelling of 2221210091 in words is "two billion, two hundred twenty-one million, two hundred ten thousand, ninety-one".