212440251 has 4 divisors (see below), whose sum is σ = 283253672. Its totient is φ = 141626832.

The previous prime is 212440231. The next prime is 212440289. The reversal of 212440251 is 152044212.

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

It is not a de Polignac number, because 212440251 - 2⁵ = 212440219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212440201) 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, 35406706 + ... + 35406711.

It is an arithmetic number, because the mean of its divisors is an integer number (70813418).

Almost surely, 2^212440251 is an apocalyptic number.

212440251 is a deficient number, since it is larger than the sum of its proper divisors (70813421).

212440251 is an equidigital number, since it uses as much as digits as its factorization.

212440251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70813420.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 212440251 is about 14575.3302192437. The cubic root of 212440251 is about 596.6856617584.

Adding to 212440251 its reverse (152044212), we get a palindrome (364484463).

The spelling of 212440251 in words is "two hundred twelve million, four hundred forty thousand, two hundred fifty-one".