212531424 has 72 divisors (see below), whose sum is σ = 648994248. Its totient is φ = 60721920.

The previous prime is 212531383. The next prime is 212531447. The reversal of 212531424 is 424135212.

212531424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 212531394 and 212531403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17887 + ... + 27294.

It is an arithmetic number, because the mean of its divisors is an integer number (9013809).

Almost surely, 2^212531424 is an apocalyptic number.

212531424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

212531424 is an abundant number, since it is smaller than the sum of its proper divisors (436462824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212531424 is a wasteful number, since it uses less digits than its factorization.

212531424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45208 (or 45193 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 212531424 is about 14578.4575315772. The cubic root of 212531424 is about 596.7710094282.

Adding to 212531424 its reverse (424135212), we get a palindrome (636666636).

The spelling of 212531424 in words is "two hundred twelve million, five hundred thirty-one thousand, four hundred twenty-four".