10221199909 has 2 divisors, whose sum is σ = 10221199910. Its totient is φ = 10221199908.

The previous prime is 10221199873. The next prime is 10221199913. The reversal of 10221199909 is 90999112201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5439062500 + 4782137409 = 73750^2 + 69153^2 .

It is a cyclic number.

It is not a de Polignac number, because 10221199909 - 2¹⁵ = 10221167141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10221199979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110599954 + 5110599955.

It is an arithmetic number, because the mean of its divisors is an integer number (5110599955).

Almost surely, 2^10221199909 is an apocalyptic number.

It is an amenable number.

10221199909 is a deficient number, since it is larger than the sum of its proper divisors (1).

10221199909 is an equidigital number, since it uses as much as digits as its factorization.

10221199909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 43.

The spelling of 10221199909 in words is "ten billion, two hundred twenty-one million, one hundred ninety-nine thousand, nine hundred nine".