212366561 has 4 divisors (see below), whose sum is σ = 231672624. Its totient is φ = 193060500.

The previous prime is 212366543. The next prime is 212366579. The reversal of 212366561 is 165663212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (212366543) and next prime (212366579).

It is a cyclic number.

It is not a de Polignac number, because 212366561 - 2²² = 208172257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212363561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9653015 + ... + 9653036.

It is an arithmetic number, because the mean of its divisors is an integer number (57918156).

Almost surely, 2^212366561 is an apocalyptic number.

It is an amenable number.

212366561 is a deficient number, since it is larger than the sum of its proper divisors (19306063).

212366561 is a wasteful number, since it uses less digits than its factorization.

212366561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19306062.

The product of its digits is 12960, while the sum is 32.

The square root of 212366561 is about 14572.8020984298. The cubic root of 212366561 is about 596.6166621987.

The spelling of 212366561 in words is "two hundred twelve million, three hundred sixty-six thousand, five hundred sixty-one".