212123261 has 8 divisors (see below), whose sum is σ = 244572864. Its totient is φ = 180210240.

The previous prime is 212123251. The next prime is 212123321. The reversal of 212123261 is 162321212.

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

It is not a de Polignac number, because 212123261 - 2¹⁰ = 212122237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212123251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133295 + ... + 134876.

It is an arithmetic number, because the mean of its divisors is an integer number (30571608).

Almost surely, 2^212123261 is an apocalyptic number.

It is an amenable number.

212123261 is a deficient number, since it is larger than the sum of its proper divisors (32449603).

212123261 is a wasteful number, since it uses less digits than its factorization.

212123261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268291.

The product of its digits is 288, while the sum is 20.

The square root of 212123261 is about 14564.4519635996. The cubic root of 212123261 is about 596.3887350680.

Adding to 212123261 its reverse (162321212), we get a palindrome (374444473).

The spelling of 212123261 in words is "two hundred twelve million, one hundred twenty-three thousand, two hundred sixty-one".