212164123 has 4 divisors (see below), whose sum is σ = 214351480. Its totient is φ = 209976768.

The previous prime is 212164033. The next prime is 212164151. The reversal of 212164123 is 321461212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212164123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212164094 and 212164103.

It is not an unprimeable number, because it can be changed into a prime (212164153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1093533 + ... + 1093726.

It is an arithmetic number, because the mean of its divisors is an integer number (53587870).

Almost surely, 2^212164123 is an apocalyptic number.

212164123 is a deficient number, since it is larger than the sum of its proper divisors (2187357).

212164123 is an equidigital number, since it uses as much as digits as its factorization.

212164123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187356.

The product of its digits is 576, while the sum is 22.

The square root of 212164123 is about 14565.8546951423. The cubic root of 212164123 is about 596.4270273825.

The spelling of 212164123 in words is "two hundred twelve million, one hundred sixty-four thousand, one hundred twenty-three".