212135389 has 2 divisors, whose sum is σ = 212135390. Its totient is φ = 212135388.

The previous prime is 212135347. The next prime is 212135419. The reversal of 212135389 is 983531212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122832889 + 89302500 = 11083^2 + 9450^2 .

It is a cyclic number.

It is not a de Polignac number, because 212135389 - 2¹⁵ = 212102621 is a prime.

It is equal to p_11712868 and since 212135389 and 11712868 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212135489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106067694 + 106067695.

It is an arithmetic number, because the mean of its divisors is an integer number (106067695).

Almost surely, 2^212135389 is an apocalyptic number.

It is an amenable number.

212135389 is a deficient number, since it is larger than the sum of its proper divisors (1).

212135389 is an equidigital number, since it uses as much as digits as its factorization.

212135389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 212135389 is about 14564.8683138571. The cubic root of 212135389 is about 596.4001008885.

The spelling of 212135389 in words is "two hundred twelve million, one hundred thirty-five thousand, three hundred eighty-nine".