1000221109 has 2 divisors, whose sum is σ = 1000221110. Its totient is φ = 1000221108.

The previous prime is 1000221083. The next prime is 1000221137. The reversal of 1000221109 is 9011220001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 975000625 + 25220484 = 31225^2 + 5022^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000221109 - 2⁹ = 1000220597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1000221092 and 1000221101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000221179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500110554 + 500110555.

It is an arithmetic number, because the mean of its divisors is an integer number (500110555).

Almost surely, 2^1000221109 is an apocalyptic number.

It is an amenable number.

1000221109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000221109 is an equidigital number, since it uses as much as digits as its factorization.

1000221109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1000221109 is about 31626.2724487095. The cubic root of 1000221109 is about 1000.0736975685.

The spelling of 1000221109 in words is "one billion, two hundred twenty-one thousand, one hundred nine".