212161306 has 32 divisors (see below), whose sum is σ = 376104960. Its totient is φ = 87868800.

The previous prime is 212161297. The next prime is 212161321. The reversal of 212161306 is 603161212.

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 in 15 ways as a sum of consecutive naturals, for example, 60871 + ... + 64261.

It is an arithmetic number, because the mean of its divisors is an integer number (11753280).

Almost surely, 2^212161306 is an apocalyptic number.

212161306 is a deficient number, since it is larger than the sum of its proper divisors (163943654).

212161306 is a wasteful number, since it uses less digits than its factorization.

212161306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3550.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 212161306 is about 14565.7579960674. The cubic root of 212161306 is about 596.4243876927.

It can be divided in two parts, 21216 and 1306, that added together give a palindrome (22522).

The spelling of 212161306 in words is "two hundred twelve million, one hundred sixty-one thousand, three hundred six".