213221485 has 8 divisors (see below), whose sum is σ = 264688920. Its totient is φ = 164695104.

The previous prime is 213221471. The next prime is 213221507. The reversal of 213221485 is 584122312.

It can be written as a sum of positive squares in 4 ways, for example, as 3493161 + 209728324 = 1869^2 + 14482^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213221485 - 2¹¹ = 213219437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 735102 + ... + 735391.

It is an arithmetic number, because the mean of its divisors is an integer number (33086115).

Almost surely, 2^213221485 is an apocalyptic number.

It is an amenable number.

213221485 is a deficient number, since it is larger than the sum of its proper divisors (51467435).

213221485 is a wasteful number, since it uses less digits than its factorization.

213221485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470527.

The product of its digits is 3840, while the sum is 28.

The square root of 213221485 is about 14602.1054988656. The cubic root of 213221485 is about 597.4161901086.

Adding to 213221485 its reverse (584122312), we get a palindrome (797343797).

The spelling of 213221485 in words is "two hundred thirteen million, two hundred twenty-one thousand, four hundred eighty-five".