21000002222189 has 2 divisors, whose sum is σ = 21000002222190. Its totient is φ = 21000002222188.

The previous prime is 21000002222183. The next prime is 21000002222197. The reversal of 21000002222189 is 98122220000012.

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., 19760603184100 + 1239399038089 = 4445290^2 + 1113283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000002222189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000002222183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500001111094 + 10500001111095.

It is an arithmetic number, because the mean of its divisors is an integer number (10500001111095).

Almost surely, 2^{21000002222189} is an apocalyptic number.

It is an amenable number.

21000002222189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000002222189 is an equidigital number, since it uses as much as digits as its factorization.

21000002222189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 21000002222189 in words is "twenty-one trillion, two million, two hundred twenty-two thousand, one hundred eighty-nine".