212857247 has 4 divisors (see below), whose sum is σ = 224060280. Its totient is φ = 201654216.

The previous prime is 212857241. The next prime is 212857259. The reversal of 212857247 is 742758212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212857247 - 2⁴ = 212857231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212857247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212857241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5601488 + ... + 5601525.

It is an arithmetic number, because the mean of its divisors is an integer number (56015070).

Almost surely, 2^212857247 is an apocalyptic number.

212857247 is a deficient number, since it is larger than the sum of its proper divisors (11203033).

212857247 is a wasteful number, since it uses less digits than its factorization.

212857247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11203032.

The product of its digits is 62720, while the sum is 38.

The square root of 212857247 is about 14589.6280624285. The cubic root of 212857247 is about 597.0758152431.

The spelling of 212857247 in words is "two hundred twelve million, eight hundred fifty-seven thousand, two hundred forty-seven".