212431213 has 4 divisors (see below), whose sum is σ = 213438208. Its totient is φ = 211424220.

The previous prime is 212431187. The next prime is 212431259. The reversal of 212431213 is 312134212.

It is a happy number.

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 212431213 - 2¹⁷ = 212300141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212431283) 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, 503181 + ... + 503602.

It is an arithmetic number, because the mean of its divisors is an integer number (53359552).

Almost surely, 2^212431213 is an apocalyptic number.

It is an amenable number.

212431213 is a deficient number, since it is larger than the sum of its proper divisors (1006995).

212431213 is a wasteful number, since it uses less digits than its factorization.

212431213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006994.

The product of its digits is 288, while the sum is 19.

The square root of 212431213 is about 14575.0201715126. The cubic root of 212431213 is about 596.6771998945.

Adding to 212431213 its reverse (312134212), we get a palindrome (524565425).

The spelling of 212431213 in words is "two hundred twelve million, four hundred thirty-one thousand, two hundred thirteen".