213106261 has 4 divisors (see below), whose sum is σ = 224322400. Its totient is φ = 201890124.

The previous prime is 213106249. The next prime is 213106351. The reversal of 213106261 is 162601312.

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 not a de Polignac number, because 213106261 - 2¹³ = 213098069 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 (213106211) by changing a digit.

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, 5608041 + ... + 5608078.

It is an arithmetic number, because the mean of its divisors is an integer number (56080600).

Almost surely, 2^213106261 is an apocalyptic number.

It is an amenable number.

213106261 is a deficient number, since it is larger than the sum of its proper divisors (11216139).

213106261 is a wasteful number, since it uses less digits than its factorization.

213106261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11216138.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 213106261 is about 14598.1595072804. The cubic root of 213106261 is about 597.3085569801.

Adding to 213106261 its reverse (162601312), we get a palindrome (375707573).

The spelling of 213106261 in words is "two hundred thirteen million, one hundred six thousand, two hundred sixty-one".