212245243 has 16 divisors (see below), whose sum is σ = 247368960. Its totient is φ = 178340256.

The previous prime is 212245217. The next prime is 212245259. The reversal of 212245243 is 342542212.

It is a cyclic number.

It is not a de Polignac number, because 212245243 - 2²¹ = 210148091 is a prime.

It is a super-2 number, since 2×212245243² = 90096086352258098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212245273) 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 15 ways as a sum of consecutive naturals, for example, 269296 + ... + 270082.

It is an arithmetic number, because the mean of its divisors is an integer number (15460560).

Almost surely, 2^212245243 is an apocalyptic number.

212245243 is a deficient number, since it is larger than the sum of its proper divisors (35123717).

212245243 is an equidigital number, since it uses as much as digits as its factorization.

212245243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506.

The product of its digits is 3840, while the sum is 25.

The square root of 212245243 is about 14568.6390236013. The cubic root of 212245243 is about 596.5030314288.

Adding to 212245243 its reverse (342542212), we get a palindrome (554787455).

The spelling of 212245243 in words is "two hundred twelve million, two hundred forty-five thousand, two hundred forty-three".