213102261 has 6 divisors (see below), whose sum is σ = 307814390. Its totient is φ = 142068168.

The previous prime is 213102247. The next prime is 213102269. The reversal of 213102261 is 162201312.

It can be written as a sum of positive squares in only one way, i.e., 183060900 + 30041361 = 13530^2 + 5481^2 .

It is not a de Polignac number, because 213102261 - 2¹⁴ = 213085877 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 (213102269) 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 5 ways as a sum of consecutive naturals, for example, 11839006 + ... + 11839023.

Almost surely, 2^213102261 is an apocalyptic number.

It is an amenable number.

213102261 is a deficient number, since it is larger than the sum of its proper divisors (94712129).

213102261 is a wasteful number, since it uses less digits than its factorization.

213102261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23678035 (or 23678032 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 213102261 is about 14598.0225030653. The cubic root of 213102261 is about 597.3048198004.

Adding to 213102261 its reverse (162201312), we get a palindrome (375303573).

The spelling of 213102261 in words is "two hundred thirteen million, one hundred two thousand, two hundred sixty-one".