1011221109 has 12 divisors (see below), whose sum is σ = 1461427500. Its totient is φ = 673789824.

The previous prime is 1011221083. The next prime is 1011221111. The reversal of 1011221109 is 9011221101.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 945562500 + 65658609 = 30750^2 + 8103^2 .

It is not a de Polignac number, because 1011221109 - 2⁵ = 1011221077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1011221091 and 1011221100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011221129) 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 in 11 ways as a sum of consecutive naturals, for example, 11284 + ... + 46365.

It is an arithmetic number, because the mean of its divisors is an integer number (121785625).

Almost surely, 2^1011221109 is an apocalyptic number.

It is an amenable number.

1011221109 is a deficient number, since it is larger than the sum of its proper divisors (450206391).

1011221109 is a wasteful number, since it uses less digits than its factorization.

1011221109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59604 (or 59601 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The square root of 1011221109 is about 31799.7029703109. The cubic root of 1011221109 is about 1003.7264658695.

The spelling of 1011221109 in words is "one billion, eleven million, two hundred twenty-one thousand, one hundred nine".