221220213 has 8 divisors (see below), whose sum is σ = 297571008. Its totient is φ = 146174784.

The previous prime is 221220163. The next prime is 221220229. The reversal of 221220213 is 312022122.

It is a happy number.

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

It is not a de Polignac number, because 221220213 - 2⁹ = 221219701 is a prime.

It is a super-3 number, since 3×221220213³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221220192 and 221220201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325945 + ... + 326622.

It is an arithmetic number, because the mean of its divisors is an integer number (37196376).

Almost surely, 2^221220213 is an apocalyptic number.

It is an amenable number.

221220213 is a deficient number, since it is larger than the sum of its proper divisors (76350795).

221220213 is a wasteful number, since it uses less digits than its factorization.

221220213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652683.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221220213 is about 14873.4734678891. The cubic root of 221220213 is about 604.7951067210.

Adding to 221220213 its reverse (312022122), we get a palindrome (533242335).

The spelling of 221220213 in words is "two hundred twenty-one million, two hundred twenty thousand, two hundred thirteen".