213221255 has 16 divisors (see below), whose sum is σ = 284438784. Its totient is φ = 152375040.

The previous prime is 213221251. The next prime is 213221377. The reversal of 213221255 is 552122312.

It is not a de Polignac number, because 213221255 - 2² = 213221251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213221255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213221251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50894 + ... + 54923.

It is an arithmetic number, because the mean of its divisors is an integer number (17777424).

Almost surely, 2^213221255 is an apocalyptic number.

213221255 is a deficient number, since it is larger than the sum of its proper divisors (71217529).

213221255 is a wasteful number, since it uses less digits than its factorization.

213221255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105866.

The product of its digits is 1200, while the sum is 23.

The square root of 213221255 is about 14602.0976232869. The cubic root of 213221255 is about 597.4159752995.

Adding to 213221255 its reverse (552122312), we get a palindrome (765343567).

The spelling of 213221255 in words is "two hundred thirteen million, two hundred twenty-one thousand, two hundred fifty-five".