1220111220989 has 2 divisors, whose sum is σ = 1220111220990. Its totient is φ = 1220111220988.

The previous prime is 1220111220961. The next prime is 1220111221031. The reversal of 1220111220989 is 9890221110221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1215874512889 + 4236708100 = 1102667^2 + 65090^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220111220989 - 2¹⁶ = 1220111155453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220111220959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610055610494 + 610055610495.

It is an arithmetic number, because the mean of its divisors is an integer number (610055610495).

Almost surely, 2^{1220111220989} is an apocalyptic number.

It is an amenable number.

1220111220989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220111220989 is an equidigital number, since it uses as much as digits as its factorization.

1220111220989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 38.

The spelling of 1220111220989 in words is "one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty thousand, nine hundred eighty-nine".