212201989 has 2 divisors, whose sum is σ = 212201990. Its totient is φ = 212201988.

The previous prime is 212201929. The next prime is 212202017. The reversal of 212201989 is 989102212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193349025 + 18852964 = 13905^2 + 4342^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212201989 is a prime.

It is a super-2 number, since 2×212201989² = 90059368271112242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212201929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106100994 + 106100995.

It is an arithmetic number, because the mean of its divisors is an integer number (106100995).

Almost surely, 2^212201989 is an apocalyptic number.

It is an amenable number.

212201989 is a deficient number, since it is larger than the sum of its proper divisors (1).

212201989 is an equidigital number, since it uses as much as digits as its factorization.

212201989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 212201989 is about 14567.1544578892. The cubic root of 212201989 is about 596.4625077173.

The spelling of 212201989 in words is "two hundred twelve million, two hundred one thousand, nine hundred eighty-nine".