212522040 has 96 divisors (see below), whose sum is σ = 692902080. Its totient is φ = 56491776.

The previous prime is 212522033. The next prime is 212522059. The reversal of 212522040 is 40225212.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 23 ways as a sum of consecutive naturals, for example, 142177 + ... + 143663.

It is an arithmetic number, because the mean of its divisors is an integer number (7217730).

Almost surely, 2^212522040 is an apocalyptic number.

212522040 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 212522040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (346451040).

212522040 is an abundant number, since it is smaller than the sum of its proper divisors (480380040).

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

212522040 is a wasteful number, since it uses less digits than its factorization.

212522040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901 (or 1894 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 212522040 is about 14578.1356832758. The cubic root of 212522040 is about 596.7622261285.

Adding to 212522040 its reverse (40225212), we get a palindrome (252747252).

The spelling of 212522040 in words is "two hundred twelve million, five hundred twenty-two thousand, forty".