1221101120189 has 2 divisors, whose sum is σ = 1221101120190. Its totient is φ = 1221101120188.

The previous prime is 1221101120177. The next prime is 1221101120233. The reversal of 1221101120189 is 9810211011221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 882598244089 + 338502876100 = 939467^2 + 581810^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221101120189 - 2³² = 1216806152893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221101170189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550560094 + 610550560095.

It is an arithmetic number, because the mean of its divisors is an integer number (610550560095).

Almost surely, 2^{1221101120189} is an apocalyptic number.

It is an amenable number.

1221101120189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221101120189 is an equidigital number, since it uses as much as digits as its factorization.

1221101120189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 29.

The spelling of 1221101120189 in words is "one trillion, two hundred twenty-one billion, one hundred one million, one hundred twenty thousand, one hundred eighty-nine".