212116906 has 4 divisors (see below), whose sum is σ = 318175362. Its totient is φ = 106058452.

The previous prime is 212116901. The next prime is 212116913. The reversal of 212116906 is 609611212.

212116906 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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., 190578025 + 21538881 = 13805^2 + 4641^2 .

It is a super-2 number, since 2×212116906² = 89987163622025672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212116901) 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, 53029225 + ... + 53029228.

Almost surely, 2^212116906 is an apocalyptic number.

212116906 is a deficient number, since it is larger than the sum of its proper divisors (106058456).

212116906 is a wasteful number, since it uses less digits than its factorization.

212116906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106058455.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 212116906 is about 14564.2337937840. The cubic root of 212116906 is about 596.3827792725.

The spelling of 212116906 in words is "two hundred twelve million, one hundred sixteen thousand, nine hundred six".