212022240 has 48 divisors (see below), whose sum is σ = 667871568. Its totient is φ = 56539136.

The previous prime is 212022229. The next prime is 212022241. The reversal of 212022240 is 42220212.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212022241) by changing a digit.

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, 220377 + ... + 221336.

It is an arithmetic number, because the mean of its divisors is an integer number (13913991).

Almost surely, 2^212022240 is an apocalyptic number.

212022240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212022240 is an abundant number, since it is smaller than the sum of its proper divisors (455849328).

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

212022240 is a wasteful number, since it uses less digits than its factorization.

212022240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441731 (or 441723 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 212022240 is about 14560.9834832679. The cubic root of 212022240 is about 596.2940458564.

Adding to 212022240 its reverse (42220212), we get a palindrome (254242452).

The spelling of 212022240 in words is "two hundred twelve million, twenty-two thousand, two hundred forty".