212313440 has 48 divisors (see below), whose sum is σ = 506072448. Its totient is φ = 84166656.

The previous prime is 212313433. The next prime is 212313461. The reversal of 212313440 is 44313212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12209 + ... + 23951.

It is an arithmetic number, because the mean of its divisors is an integer number (10543176).

Almost surely, 2^212313440 is an apocalyptic number.

212313440 is a gapful number since it is divisible by the number (20) 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 212313440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253036224).

212313440 is an abundant number, since it is smaller than the sum of its proper divisors (293759008).

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

212313440 is a wasteful number, since it uses less digits than its factorization.

212313440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11871 (or 11863 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 212313440 is about 14570.9793768298. The cubic root of 212313440 is about 596.5669125010.

Adding to 212313440 its reverse (44313212), we get a palindrome (256626652).

The spelling of 212313440 in words is "two hundred twelve million, three hundred thirteen thousand, four hundred forty".