212243403 has 4 divisors (see below), whose sum is σ = 282991208. Its totient is φ = 141495600.

The previous prime is 212243401. The next prime is 212243407. The reversal of 212243403 is 304342212.

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

It is not a de Polignac number, because 212243403 - 2¹ = 212243401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212243403.

It is not an unprimeable number, because it can be changed into a prime (212243401) 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, 35373898 + ... + 35373903.

It is an arithmetic number, because the mean of its divisors is an integer number (70747802).

Almost surely, 2^212243403 is an apocalyptic number.

212243403 is a deficient number, since it is larger than the sum of its proper divisors (70747805).

212243403 is an equidigital number, since it uses as much as digits as its factorization.

212243403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70747804.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 212243403 is about 14568.5758741203. The cubic root of 212243403 is about 596.5013076859.

Adding to 212243403 its reverse (304342212), we get a palindrome (516585615).

The spelling of 212243403 in words is "two hundred twelve million, two hundred forty-three thousand, four hundred three".