212266445 has 4 divisors (see below), whose sum is σ = 254719740. Its totient is φ = 169813152.

The previous prime is 212266421. The next prime is 212266451. The reversal of 212266445 is 544662212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 161315401 + 50951044 = 12701^2 + 7138^2 .

It is a cyclic number.

It is not a de Polignac number, because 212266445 - 2⁶ = 212266381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21226640 + ... + 21226649.

It is an arithmetic number, because the mean of its divisors is an integer number (63679935).

Almost surely, 2^212266445 is an apocalyptic number.

It is an amenable number.

212266445 is a deficient number, since it is larger than the sum of its proper divisors (42453295).

212266445 is an equidigital number, since it uses as much as digits as its factorization.

212266445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42453294.

The product of its digits is 23040, while the sum is 32.

The square root of 212266445 is about 14569.3666643406. The cubic root of 212266445 is about 596.5228931008.

The spelling of 212266445 in words is "two hundred twelve million, two hundred sixty-six thousand, four hundred forty-five".