212443431031 has 4 divisors (see below), whose sum is σ = 228785233432. Its totient is φ = 196101628632.

The previous prime is 212443431023. The next prime is 212443431043. The reversal of 212443431031 is 130134344212.

It is a happy number.

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

It is not a de Polignac number, because 212443431031 - 2³ = 212443431023 is a prime.

It is a super-2 number, since 2×212443431031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212443431131) 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, 8170901181 + ... + 8170901206.

It is an arithmetic number, because the mean of its divisors is an integer number (57196308358).

Almost surely, 2^212443431031 is an apocalyptic number.

212443431031 is a deficient number, since it is larger than the sum of its proper divisors (16341802401).

212443431031 is a wasteful number, since it uses less digits than its factorization.

212443431031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16341802400.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 212443431031 its reverse (130134344212), we get a palindrome (342577775243).

The spelling of 212443431031 in words is "two hundred twelve billion, four hundred forty-three million, four hundred thirty-one thousand, thirty-one".