220021201 has 4 divisors (see below), whose sum is σ = 220965732. Its totient is φ = 219076672.

The previous prime is 220021183. The next prime is 220021253. The reversal of 220021201 is 102120022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77457601 + 142563600 = 8801^2 + 11940^2 .

It is a cyclic number.

It is not a de Polignac number, because 220021201 - 2⁵ = 220021169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220021301) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 471916 + ... + 472381.

It is an arithmetic number, because the mean of its divisors is an integer number (55241433).

Almost surely, 2^220021201 is an apocalyptic number.

It is an amenable number.

220021201 is a deficient number, since it is larger than the sum of its proper divisors (944531).

220021201 is an equidigital number, since it uses as much as digits as its factorization.

220021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944530.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 220021201 is about 14833.1116425381. Note that the first 3 decimals coincide. The cubic root of 220021201 is about 603.7004649394.

Adding to 220021201 its reverse (102120022), we get a palindrome (322141223).

The spelling of 220021201 in words is "two hundred twenty million, twenty-one thousand, two hundred one".