213406213 has 4 divisors (see below), whose sum is σ = 222684768. Its totient is φ = 204127660.

The previous prime is 213406199. The next prime is 213406279. The reversal of 213406213 is 312604312.

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 213406213 - 2⁵ = 213406181 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 (213406313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4639243 + ... + 4639288.

It is an arithmetic number, because the mean of its divisors is an integer number (55671192).

Almost surely, 2^213406213 is an apocalyptic number.

213406213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

213406213 is a deficient number, since it is larger than the sum of its proper divisors (9278555).

213406213 is an equidigital number, since it uses as much as digits as its factorization.

213406213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9278554.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 213406213 is about 14608.4295186033. The cubic root of 213406213 is about 597.5886674783.

The spelling of 213406213 in words is "two hundred thirteen million, four hundred six thousand, two hundred thirteen".