1000221121189 has 2 divisors, whose sum is σ = 1000221121190. Its totient is φ = 1000221121188.

The previous prime is 1000221121187. The next prime is 1000221121243. The reversal of 1000221121189 is 9811211220001.

1000221121189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 971884448964 + 28336672225 = 985842^2 + 168335^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000221121189 - 2¹ = 1000221121187 is a prime.

Together with 1000221121187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000221121187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500110560594 + 500110560595.

It is an arithmetic number, because the mean of its divisors is an integer number (500110560595).

Almost surely, 2^{1000221121189} is an apocalyptic number.

It is an amenable number.

1000221121189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000221121189 is an equidigital number, since it uses as much as digits as its factorization.

1000221121189 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 28.

The spelling of 1000221121189 in words is "one trillion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred eighty-nine".