212531436 has 72 divisors (see below), whose sum is σ = 584307360. Its totient is φ = 64744704.

The previous prime is 212531383. The next prime is 212531447. The reversal of 212531436 is 634135212.

It is a super-2 number, since 2×212531436² = 90339222576444192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46000 + ... + 50408.

It is an arithmetic number, because the mean of its divisors is an integer number (8115380).

Almost surely, 2^212531436 is an apocalyptic number.

212531436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212531436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292153680).

212531436 is an abundant number, since it is smaller than the sum of its proper divisors (371775924).

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

212531436 is a wasteful number, since it uses less digits than its factorization.

212531436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535 (or 4530 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 212531436 is about 14578.4579431434. The cubic root of 212531436 is about 596.7710206599.

Adding to 212531436 its reverse (634135212), we get a palindrome (846666648).

The spelling of 212531436 in words is "two hundred twelve million, five hundred thirty-one thousand, four hundred thirty-six".