213102231 has 4 divisors (see below), whose sum is σ = 284136312. Its totient is φ = 142068152.

The previous prime is 213102209. The next prime is 213102247. The reversal of 213102231 is 132201312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213102231 - 2⁶ = 213102167 is a prime.

It is a super-2 number, since 2×213102231² = 90825121714354722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 213102231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213102731) 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, 35517036 + ... + 35517041.

It is an arithmetic number, because the mean of its divisors is an integer number (71034078).

Almost surely, 2^213102231 is an apocalyptic number.

213102231 is a deficient number, since it is larger than the sum of its proper divisors (71034081).

213102231 is an equidigital number, since it uses as much as digits as its factorization.

213102231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71034080.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 213102231 is about 14598.0214755288. The cubic root of 213102231 is about 597.3047917714.

Adding to 213102231 its reverse (132201312), we get a palindrome (345303543).

The spelling of 213102231 in words is "two hundred thirteen million, one hundred two thousand, two hundred thirty-one".