213228361 has 4 divisors (see below), whose sum is σ = 213259792. Its totient is φ = 213196932.

The previous prime is 213228359. The next prime is 213228383. The reversal of 213228361 is 163822312.

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 213228361 - 2¹ = 213228359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213228311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 855 + ... + 20668.

It is an arithmetic number, because the mean of its divisors is an integer number (53314948).

Almost surely, 2^213228361 is an apocalyptic number.

It is an amenable number.

213228361 is a deficient number, since it is larger than the sum of its proper divisors (31431).

213228361 is an equidigital number, since it uses as much as digits as its factorization.

213228361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31430.

The product of its digits is 3456, while the sum is 28.

The square root of 213228361 is about 14602.3409424654. The cubic root of 213228361 is about 597.4226118967.

The spelling of 213228361 in words is "two hundred thirteen million, two hundred twenty-eight thousand, three hundred sixty-one".