212942189 has 2 divisors, whose sum is σ = 212942190. Its totient is φ = 212942188.

The previous prime is 212942183. The next prime is 212942207. The reversal of 212942189 is 981249212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209294089 + 3648100 = 14467^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 212942189 - 2⁸ = 212941933 is a prime.

It is a super-2 number, since 2×212942189² = 90688751712223442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212942183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106471094 + 106471095.

It is an arithmetic number, because the mean of its divisors is an integer number (106471095).

Almost surely, 2^212942189 is an apocalyptic number.

It is an amenable number.

212942189 is a deficient number, since it is larger than the sum of its proper divisors (1).

212942189 is an equidigital number, since it uses as much as digits as its factorization.

212942189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 212942189 is about 14592.5388126947. The cubic root of 212942189 is about 597.1552269456.

The spelling of 212942189 in words is "two hundred twelve million, nine hundred forty-two thousand, one hundred eighty-nine".