221331211009 has 2 divisors, whose sum is σ = 221331211010. Its totient is φ = 221331211008.

The previous prime is 221331210953. The next prime is 221331211043. The reversal of 221331211009 is 900112133122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145721610225 + 75609600784 = 381735^2 + 274972^2 .

It is a cyclic number.

It is not a de Polignac number, because 221331211009 - 2¹³ = 221331202817 is a prime.

It is not a weakly prime, because it can be changed into another prime (221331211709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110665605504 + 110665605505.

It is an arithmetic number, because the mean of its divisors is an integer number (110665605505).

Almost surely, 2^221331211009 is an apocalyptic number.

It is an amenable number.

221331211009 is a deficient number, since it is larger than the sum of its proper divisors (1).

221331211009 is an equidigital number, since it uses as much as digits as its factorization.

221331211009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 221331211009 in words is "two hundred twenty-one billion, three hundred thirty-one million, two hundred eleven thousand, nine".