212223145 has 4 divisors (see below), whose sum is σ = 254667780. Its totient is φ = 169778512.

The previous prime is 212223133. The next prime is 212223149. The reversal of 212223145 is 541322212.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26255376 + 185967769 = 5124^2 + 13637^2 .

It is a cyclic number.

It is not a de Polignac number, because 212223145 - 2²³ = 203834537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212223149) 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, 21222310 + ... + 21222319.

It is an arithmetic number, because the mean of its divisors is an integer number (63666945).

Almost surely, 2^212223145 is an apocalyptic number.

It is an amenable number.

212223145 is a deficient number, since it is larger than the sum of its proper divisors (42444635).

212223145 is an equidigital number, since it uses as much as digits as its factorization.

212223145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42444634.

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

The square root of 212223145 is about 14567.8805939642. The cubic root of 212223145 is about 596.4823289916.

Adding to 212223145 its reverse (541322212), we get a palindrome (753545357).

The spelling of 212223145 in words is "two hundred twelve million, two hundred twenty-three thousand, one hundred forty-five".