213106165 has 4 divisors (see below), whose sum is σ = 255727404. Its totient is φ = 170484928.

The previous prime is 213106141. The next prime is 213106177. The reversal of 213106165 is 561601312.

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 146095569 + 67010596 = 12087^2 + 8186^2 .

It is a cyclic number.

It is not a de Polignac number, because 213106165 - 2¹¹ = 213104117 is a prime.

It is a super-2 number, since 2×213106165² = 90828475122014450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21310612 + ... + 21310621.

It is an arithmetic number, because the mean of its divisors is an integer number (63931851).

Almost surely, 2^213106165 is an apocalyptic number.

It is an amenable number.

213106165 is a deficient number, since it is larger than the sum of its proper divisors (42621239).

213106165 is an equidigital number, since it uses as much as digits as its factorization.

213106165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42621238.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 213106165 is about 14598.1562191943. The cubic root of 213106165 is about 597.3084672883.

Adding to 213106165 its reverse (561601312), we get a palindrome (774707477).

The spelling of 213106165 in words is "two hundred thirteen million, one hundred six thousand, one hundred sixty-five".