212272261 has 4 divisors (see below), whose sum is σ = 216277452. Its totient is φ = 208267072.

The previous prime is 212272259. The next prime is 212272273. The reversal of 212272261 is 162272212.

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 121660900 + 90611361 = 11030^2 + 9519^2 .

It is a cyclic number.

It is not a de Polignac number, because 212272261 - 2¹ = 212272259 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 (212272201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2002516 + ... + 2002621.

It is an arithmetic number, because the mean of its divisors is an integer number (54069363).

Almost surely, 2^212272261 is an apocalyptic number.

It is an amenable number.

212272261 is a deficient number, since it is larger than the sum of its proper divisors (4005191).

212272261 is an equidigital number, since it uses as much as digits as its factorization.

212272261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4005190.

The product of its digits is 1344, while the sum is 25.

The square root of 212272261 is about 14569.5662598445. The cubic root of 212272261 is about 596.5283411992.

The spelling of 212272261 in words is "two hundred twelve million, two hundred seventy-two thousand, two hundred sixty-one".