212145240 has 32 divisors (see below), whose sum is σ = 636436080. Its totient is φ = 56572032.

The previous prime is 212145239. The next prime is 212145259. The reversal of 212145240 is 42541212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 883819 + ... + 884058.

Almost surely, 2^212145240 is an apocalyptic number.

212145240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212145240 is an abundant number, since it is smaller than the sum of its proper divisors (424290840).

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

212145240 is a wasteful number, since it uses less digits than its factorization.

212145240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767891 (or 1767887 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 212145240 is about 14565.2064866929. The cubic root of 212145240 is about 596.4093324874.

Adding to 212145240 its reverse (42541212), we get a palindrome (254686452).

The spelling of 212145240 in words is "two hundred twelve million, one hundred forty-five thousand, two hundred forty".