212266561 has 8 divisors (see below), whose sum is σ = 229222784. Its totient is φ = 195400080.

The previous prime is 212266547. The next prime is 212266577. The reversal of 212266561 is 165662212.

212266561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212266561 - 2⁹ = 212266049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212266531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17475 + ... + 27016.

It is an arithmetic number, because the mean of its divisors is an integer number (28652848).

Almost surely, 2^212266561 is an apocalyptic number.

It is an amenable number.

212266561 is a deficient number, since it is larger than the sum of its proper divisors (16956223).

212266561 is a wasteful number, since it uses less digits than its factorization.

212266561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44871.

The product of its digits is 8640, while the sum is 31.

The square root of 212266561 is about 14569.3706452956. The cubic root of 212266561 is about 596.5230017640.

The spelling of 212266561 in words is "two hundred twelve million, two hundred sixty-six thousand, five hundred sixty-one".