221011109989 has 2 divisors, whose sum is σ = 221011109990. Its totient is φ = 221011109988.

The previous prime is 221011109981. The next prime is 221011110029. The reversal of 221011109989 is 989901110122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132226776900 + 88784333089 = 363630^2 + 297967^2 .

It is a cyclic number.

It is not a de Polignac number, because 221011109989 - 2³ = 221011109981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221011109981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505554994 + 110505554995.

It is an arithmetic number, because the mean of its divisors is an integer number (110505554995).

Almost surely, 2^221011109989 is an apocalyptic number.

It is an amenable number.

221011109989 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011109989 is an equidigital number, since it uses as much as digits as its factorization.

221011109989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 43.

The spelling of 221011109989 in words is "two hundred twenty-one billion, eleven million, one hundred nine thousand, nine hundred eighty-nine".