220221221 has 8 divisors (see below), whose sum is σ = 241241088. Its totient is φ = 199368000.

The previous prime is 220221193. The next prime is 220221223. The reversal of 220221221 is 122122022.

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 220221221 - 2¹⁰ = 220220197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220221196 and 220221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220221223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38885 + ... + 44186.

It is an arithmetic number, because the mean of its divisors is an integer number (30155136).

Almost surely, 2^220221221 is an apocalyptic number.

It is an amenable number.

220221221 is a deficient number, since it is larger than the sum of its proper divisors (21019867).

220221221 is a wasteful number, since it uses less digits than its factorization.

220221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83323.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 220221221 is about 14839.8524588353. The cubic root of 220221221 is about 603.8833497299.

Adding to 220221221 its reverse (122122022), we get a palindrome (342343243).

It can be divided in two parts, 22022 and 1221, that multiplied together give a palindrome (26888862).

The spelling of 220221221 in words is "two hundred twenty million, two hundred twenty-one thousand, two hundred twenty-one".