212443431 has 16 divisors (see below), whose sum is σ = 293372928. Its totient is φ = 136656800.

The previous prime is 212443423. The next prime is 212443453. The reversal of 212443431 is 134344212.

It is a cyclic number.

It is not a de Polignac number, because 212443431 - 2³ = 212443423 is a prime.

It is a super-2 number, since 2×212443431² = 90264422750103522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212441431) 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 15 ways as a sum of consecutive naturals, for example, 600 + ... + 20621.

It is an arithmetic number, because the mean of its divisors is an integer number (18335808).

Almost surely, 2^212443431 is an apocalyptic number.

212443431 is a deficient number, since it is larger than the sum of its proper divisors (80929497).

212443431 is a wasteful number, since it uses less digits than its factorization.

212443431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21342.

The product of its digits is 2304, while the sum is 24.

The square root of 212443431 is about 14575.4393072730. The cubic root of 212443431 is about 596.6886389892.

Adding to 212443431 its reverse (134344212), we get a palindrome (346787643).

The spelling of 212443431 in words is "two hundred twelve million, four hundred forty-three thousand, four hundred thirty-one".