221020213 has 8 divisors (see below), whose sum is σ = 234506880. Its totient is φ = 207587520.

The previous prime is 221020211. The next prime is 221020237. The reversal of 221020213 is 312020122.

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 221020213 - 2¹ = 221020211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221020193 and 221020202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020211) 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 7 ways as a sum of consecutive naturals, for example, 4893 + ... + 21586.

It is an arithmetic number, because the mean of its divisors is an integer number (29313360).

Almost surely, 2^221020213 is an apocalyptic number.

It is an amenable number.

221020213 is a deficient number, since it is larger than the sum of its proper divisors (13486667).

221020213 is a wasteful number, since it uses less digits than its factorization.

221020213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26987.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 221020213 is about 14866.7485685337. The cubic root of 221020213 is about 604.6127914161.

Adding to 221020213 its reverse (312020122), we get a palindrome (533040335).

Subtracting 221020213 from its reverse (312020122), we obtain a palindrome (90999909).

The spelling of 221020213 in words is "two hundred twenty-one million, twenty thousand, two hundred thirteen".