2102021189 has 2 divisors, whose sum is σ = 2102021190. Its totient is φ = 2102021188.

The previous prime is 2102021179. The next prime is 2102021209. The reversal of 2102021189 is 9811202012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1466124100 + 635897089 = 38290^2 + 25217^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102021189 - 2⁸ = 2102020933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102021179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051010594 + 1051010595.

It is an arithmetic number, because the mean of its divisors is an integer number (1051010595).

Almost surely, 2^2102021189 is an apocalyptic number.

It is an amenable number.

2102021189 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102021189 is an equidigital number, since it uses as much as digits as its factorization.

2102021189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 2102021189 is about 45847.8046257397. The cubic root of 2102021189 is about 1280.9898733336.

The spelling of 2102021189 in words is "two billion, one hundred two million, twenty-one thousand, one hundred eighty-nine".