11221211109989 has 2 divisors, whose sum is σ = 11221211109990. Its totient is φ = 11221211109988.

The previous prime is 11221211109959. The next prime is 11221211110009. The reversal of 11221211109989 is 98990111212211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11219599087489 + 1612022500 = 3349567^2 + 40150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11221211109989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11221211109959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610605554994 + 5610605554995.

It is an arithmetic number, because the mean of its divisors is an integer number (5610605554995).

Almost surely, 2^{11221211109989} is an apocalyptic number.

It is an amenable number.

11221211109989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221211109989 is an equidigital number, since it uses as much as digits as its factorization.

11221211109989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 47.

The spelling of 11221211109989 in words is "eleven trillion, two hundred twenty-one billion, two hundred eleven million, one hundred nine thousand, nine hundred eighty-nine".