212065538 has 4 divisors (see below), whose sum is σ = 318098310. Its totient is φ = 106032768.

The previous prime is 212065523. The next prime is 212065549. The reversal of 212065538 is 835560212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 180176929 + 31888609 = 13423^2 + 5647^2 .

It is a Curzon number.

It is an unprimeable number.

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, 53016383 + ... + 53016386.

Almost surely, 2^212065538 is an apocalyptic number.

212065538 is a deficient number, since it is larger than the sum of its proper divisors (106032772).

212065538 is a wasteful number, since it uses less digits than its factorization.

212065538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106032771.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 212065538 is about 14562.4701888107. The cubic root of 212065538 is about 596.3346337091.

The spelling of 212065538 in words is "two hundred twelve million, sixty-five thousand, five hundred thirty-eight".