212136469 has 2 divisors, whose sum is σ = 212136470. Its totient is φ = 212136468.

The previous prime is 212136451. The next prime is 212136493. The reversal of 212136469 is 964631212.

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., 204776100 + 7360369 = 14310^2 + 2713^2 .

It is a cyclic number.

It is not a de Polignac number, because 212136469 - 2⁵ = 212136437 is a prime.

It is a super-2 number, since 2×212136469² = 90003762959575922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212134469) 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, 106068234 + 106068235.

It is an arithmetic number, because the mean of its divisors is an integer number (106068235).

Almost surely, 2^212136469 is an apocalyptic number.

It is an amenable number.

212136469 is a deficient number, since it is larger than the sum of its proper divisors (1).

212136469 is an equidigital number, since it uses as much as digits as its factorization.

212136469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 212136469 is about 14564.9053893254. The cubic root of 212136469 is about 596.4011129953.

The spelling of 212136469 in words is "two hundred twelve million, one hundred thirty-six thousand, four hundred sixty-nine".