212440417 has 4 divisors (see below), whose sum is σ = 242789056. Its totient is φ = 182091780.

The previous prime is 212440411. The next prime is 212440429. The reversal of 212440417 is 714044212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212440417 - 2⁷ = 212440289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212440391 and 212440400.

It is not an unprimeable number, because it can be changed into a prime (212440411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15174309 + ... + 15174322.

It is an arithmetic number, because the mean of its divisors is an integer number (60697264).

Almost surely, 2^212440417 is an apocalyptic number.

It is an amenable number.

212440417 is a deficient number, since it is larger than the sum of its proper divisors (30348639).

212440417 is an equidigital number, since it uses as much as digits as its factorization.

212440417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30348638.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 212440417 is about 14575.3359137963. The cubic root of 212440417 is about 596.6858171744.

Adding to 212440417 its reverse (714044212), we get a palindrome (926484629).

The spelling of 212440417 in words is "two hundred twelve million, four hundred forty thousand, four hundred seventeen".