212145223 has 2 divisors, whose sum is σ = 212145224. Its totient is φ = 212145222.

The previous prime is 212145221. The next prime is 212145239. The reversal of 212145223 is 322541212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212145223 - 2¹ = 212145221 is a prime.

Together with 212145221, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 212145194 and 212145203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212145221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106072611 + 106072612.

It is an arithmetic number, because the mean of its divisors is an integer number (106072612).

Almost surely, 2^212145223 is an apocalyptic number.

212145223 is a deficient number, since it is larger than the sum of its proper divisors (1).

212145223 is an equidigital number, since it uses as much as digits as its factorization.

212145223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 22.

The square root of 212145223 is about 14565.2059031103. The cubic root of 212145223 is about 596.4093165565.

Adding to 212145223 its reverse (322541212), we get a palindrome (534686435).

It can be divided in two parts, 2 and 12145223, that added together give a square (12145225 = 3485²).

The spelling of 212145223 in words is "two hundred twelve million, one hundred forty-five thousand, two hundred twenty-three".