212057340 has 72 divisors (see below), whose sum is σ = 652668240. Its totient is φ = 51406080.

The previous prime is 212057317. The next prime is 212057341. The reversal of 212057340 is 43750212.

It is a self number, because there is not a number n which added to its sum of digits gives 212057340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212057341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7345 + ... + 21864.

Almost surely, 2^212057340 is an apocalyptic number.

212057340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212057340 is an abundant number, since it is smaller than the sum of its proper divisors (440610900).

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

212057340 is a wasteful number, since it uses less digits than its factorization.

212057340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29243 (or 29230 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 212057340 is about 14562.1887091192. The cubic root of 212057340 is about 596.3269492697.

The spelling of 212057340 in words is "two hundred twelve million, fifty-seven thousand, three hundred forty".