212531443 has 8 divisors (see below), whose sum is σ = 220845056. Its totient is φ = 204309000.

The previous prime is 212531383. The next prime is 212531447. The reversal of 212531443 is 344135212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212531443 is a prime.

It is a super-2 number, since 2×212531443² = 90339228527324498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212531447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18021 + ... + 27382.

It is an arithmetic number, because the mean of its divisors is an integer number (27605632).

Almost surely, 2^212531443 is an apocalyptic number.

212531443 is a deficient number, since it is larger than the sum of its proper divisors (8313613).

212531443 is a wasteful number, since it uses less digits than its factorization.

212531443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45585.

The product of its digits is 2880, while the sum is 25.

The square root of 212531443 is about 14578.4581832236. The cubic root of 212531443 is about 596.7710272117.

Adding to 212531443 its reverse (344135212), we get a palindrome (556666655).

The spelling of 212531443 in words is "two hundred twelve million, five hundred thirty-one thousand, four hundred forty-three".