221020311032909 has 2 divisors, whose sum is σ = 221020311032910. Its totient is φ = 221020311032908.

The previous prime is 221020311032891. The next prime is 221020311032971. The reversal of 221020311032909 is 909230113020122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218550393902500 + 2469917130409 = 14783450^2 + 1571597^2 .

It is a cyclic number.

It is not a de Polignac number, because 221020311032909 - 2²⁴ = 221020294255693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221020311032009) 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, 110510155516454 + 110510155516455.

It is an arithmetic number, because the mean of its divisors is an integer number (110510155516455).

Almost surely, 2^{221020311032909} is an apocalyptic number.

It is an amenable number.

221020311032909 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020311032909 is an equidigital number, since it uses as much as digits as its factorization.

221020311032909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The spelling of 221020311032909 in words is "two hundred twenty-one trillion, twenty billion, three hundred eleven million, thirty-two thousand, nine hundred nine".