212106181 has 8 divisors (see below), whose sum is σ = 245821824. Its totient is φ = 179244240.

The previous prime is 212106151. The next prime is 212106197. The reversal of 212106181 is 181601212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212106181 - 2¹¹ = 212104133 is a prime.

It is a super-2 number, since 2×212106181² = 89978064036809522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212106151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212890 + ... + 213883.

It is an arithmetic number, because the mean of its divisors is an integer number (30727728).

Almost surely, 2^212106181 is an apocalyptic number.

It is an amenable number.

212106181 is a deficient number, since it is larger than the sum of its proper divisors (33715643).

212106181 is an equidigital number, since it uses as much as digits as its factorization.

212106181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426851.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 212106181 is about 14563.8655926234. The cubic root of 212106181 is about 596.3727277193.

Adding to 212106181 its reverse (181601212), we get a palindrome (393707393).

The spelling of 212106181 in words is "two hundred twelve million, one hundred six thousand, one hundred eighty-one".