212261 has 4 divisors (see below), whose sum is σ = 242592. Its totient is φ = 181932.

The previous prime is 212243. The next prime is 212281. The reversal of 212261 is 162212.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212281) 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, 15155 + ... + 15168.

It is an arithmetic number, because the mean of its divisors is an integer number (60648).

2²¹²²⁶¹ is an apocalyptic number.

It is an amenable number.

212261 is a deficient number, since it is larger than the sum of its proper divisors (30331).

212261 is an equidigital number, since it uses as much as digits as its factorization.

212261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30330.

The product of its digits is 48, while the sum is 14.

The square root of 212261 is about 460.7179180366. The cubic root of 212261 is about 59.6517792444.

Adding to 212261 its reverse (162212), we get a palindrome (374473).

The spelling of 212261 in words is "two hundred twelve thousand, two hundred sixty-one".