212105166251 has 8 divisors (see below), whose sum is σ = 233678420208. Its totient is φ = 190913740000.

The previous prime is 212105166209. The next prime is 212105166263. The reversal of 212105166251 is 152661501212.

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

It is a cyclic number.

It is not a de Polignac number, because 212105166251 - 2⁶ = 212105166187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212107166251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95455760 + ... + 95457981.

It is an arithmetic number, because the mean of its divisors is an integer number (29209802526).

Almost surely, 2^212105166251 is an apocalyptic number.

212105166251 is a deficient number, since it is larger than the sum of its proper divisors (21573253957).

212105166251 is a wasteful number, since it uses less digits than its factorization.

212105166251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190913853.

The product of its (nonzero) digits is 7200, while the sum is 32.

Adding to 212105166251 its reverse (152661501212), we get a palindrome (364766667463).

The spelling of 212105166251 in words is "two hundred twelve billion, one hundred five million, one hundred sixty-six thousand, two hundred fifty-one".