201020221 has 4 divisors (see below), whose sum is σ = 202369500. Its totient is φ = 199670944.

The previous prime is 201020201. The next prime is 201020233. The reversal of 201020221 is 122020102.

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 70375321 + 130644900 = 8389^2 + 11430^2 .

It is a cyclic number.

It is not a de Polignac number, because 201020221 - 2¹¹ = 201018173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201020198 and 201020207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201020201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 674416 + ... + 674713.

It is an arithmetic number, because the mean of its divisors is an integer number (50592375).

Almost surely, 2^201020221 is an apocalyptic number.

It is an amenable number.

201020221 is a deficient number, since it is larger than the sum of its proper divisors (1349279).

201020221 is a wasteful number, since it uses less digits than its factorization.

201020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349278.

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

The square root of 201020221 is about 14178.1600005078. The cubic root of 201020221 is about 585.7962430369.

Adding to 201020221 its reverse (122020102), we get a palindrome (323040323).

The spelling of 201020221 in words is "two hundred one million, twenty thousand, two hundred twenty-one".