18221032209979 has 2 divisors, whose sum is σ = 18221032209980. Its totient is φ = 18221032209978.

The previous prime is 18221032209901. The next prime is 18221032210033. The reversal of 18221032209979 is 97990223012281.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18221032209979 - 2⁴³ = 9424939187771 is a prime.

It is not a weakly prime, because it can be changed into another prime (18221032209179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9110516104989 + 9110516104990.

It is an arithmetic number, because the mean of its divisors is an integer number (9110516104990).

Almost surely, 2^{18221032209979} is an apocalyptic number.

18221032209979 is a deficient number, since it is larger than the sum of its proper divisors (1).

18221032209979 is an equidigital number, since it uses as much as digits as its factorization.

18221032209979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 18221032209979 in words is "eighteen trillion, two hundred twenty-one billion, thirty-two million, two hundred nine thousand, nine hundred seventy-nine".