212422340 has 48 divisors (see below), whose sum is σ = 481983600. Its totient is φ = 78174720.

The previous prime is 212422333. The next prime is 212422367. The reversal of 212422340 is 43224212.

It can be written as a sum of positive squares in 8 ways, for example, as 952576 + 211469764 = 976^2 + 14542^2 .

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

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 15 ways as a sum of consecutive naturals, for example, 89570 + ... + 91910.

It is an arithmetic number, because the mean of its divisors is an integer number (10041325).

Almost surely, 2^212422340 is an apocalyptic number.

212422340 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 212422340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240991800).

212422340 is an abundant number, since it is smaller than the sum of its proper divisors (269561260).

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

212422340 is a wasteful number, since it uses less digits than its factorization.

212422340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2712 (or 2710 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 212422340 is about 14574.7157776747. The cubic root of 212422340 is about 596.6688922790.

Adding to 212422340 its reverse (43224212), we get a palindrome (255646552).

The spelling of 212422340 in words is "two hundred twelve million, four hundred twenty-two thousand, three hundred forty".