212644643 has 4 divisors (see below), whose sum is σ = 214526568. Its totient is φ = 210762720.

The previous prime is 212644613. The next prime is 212644657. The reversal of 212644643 is 346446212.

212644643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212644643 - 2⁸ = 212644387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212644603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 940793 + ... + 941018.

It is an arithmetic number, because the mean of its divisors is an integer number (53631642).

Almost surely, 2^212644643 is an apocalyptic number.

212644643 is a deficient number, since it is larger than the sum of its proper divisors (1881925).

212644643 is a wasteful number, since it uses less digits than its factorization.

212644643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881924.

The product of its digits is 27648, while the sum is 32.

The square root of 212644643 is about 14582.3401071296. The cubic root of 212644643 is about 596.8769605411.

The spelling of 212644643 in words is "two hundred twelve million, six hundred forty-four thousand, six hundred forty-three".