212705247 has 16 divisors (see below), whose sum is σ = 298895360. Its totient is φ = 134177472.

The previous prime is 212705243. The next prime is 212705249. The reversal of 212705247 is 742507212.

It is not a de Polignac number, because 212705247 - 2² = 212705243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212705243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60243 + ... + 63675.

It is an arithmetic number, because the mean of its divisors is an integer number (18680960).

Almost surely, 2^212705247 is an apocalyptic number.

212705247 is a deficient number, since it is larger than the sum of its proper divisors (86190113).

212705247 is a wasteful number, since it uses less digits than its factorization.

212705247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4542.

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 212705247 is about 14584.4179520473. The cubic root of 212705247 is about 596.9336587252.

The spelling of 212705247 in words is "two hundred twelve million, seven hundred five thousand, two hundred forty-seven".