212123105 has 8 divisors (see below), whose sum is σ = 256257000. Its totient is φ = 168558976.

The previous prime is 212123083. The next prime is 212123117. The reversal of 212123105 is 501321212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4532641 + 207590464 = 2129^2 + 14408^2 .

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 212123105 - 2¹⁰ = 212122081 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141620 + ... + 143109.

It is an arithmetic number, because the mean of its divisors is an integer number (32032125).

Almost surely, 2^212123105 is an apocalyptic number.

It is an amenable number.

212123105 is a deficient number, since it is larger than the sum of its proper divisors (44133895).

212123105 is a wasteful number, since it uses less digits than its factorization.

212123105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284883.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 212123105 is about 14564.4466080933. The cubic root of 212123105 is about 596.3885888689.

Adding to 212123105 its reverse (501321212), we get a palindrome (713444317).

The spelling of 212123105 in words is "two hundred twelve million, one hundred twenty-three thousand, one hundred five".