212132261 has 4 divisors (see below), whose sum is σ = 231417024. Its totient is φ = 192847500.

The previous prime is 212132257. The next prime is 212132267. The reversal of 212132261 is 162231212.

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 not a de Polignac number, because 212132261 - 2² = 212132257 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 (212132267) 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, 9642365 + ... + 9642386.

It is an arithmetic number, because the mean of its divisors is an integer number (57854256).

Almost surely, 2^212132261 is an apocalyptic number.

It is an amenable number.

212132261 is a deficient number, since it is larger than the sum of its proper divisors (19284763).

212132261 is a wasteful number, since it uses less digits than its factorization.

212132261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19284762.

The product of its digits is 288, while the sum is 20.

The square root of 212132261 is about 14564.7609317833. The cubic root of 212132261 is about 596.3971695079.

Adding to 212132261 its reverse (162231212), we get a palindrome (374363473).

The spelling of 212132261 in words is "two hundred twelve million, one hundred thirty-two thousand, two hundred sixty-one".