202001220221 has 4 divisors (see below), whose sum is σ = 203117249244. Its totient is φ = 200885191200.

The previous prime is 202001220167. The next prime is 202001220277. The reversal of 202001220221 is 122022100202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122022100202 = 2 ⋅61011050101.

It can be written as a sum of positive squares in 2 ways, for example, as 106201684996 + 95799535225 = 325886^2 + 309515^2 .

It is a cyclic number.

It is not a de Polignac number, because 202001220221 - 2¹⁸ = 202000958077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202001220196 and 202001220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202001250221) 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 3 ways as a sum of consecutive naturals, for example, 558014240 + ... + 558014601.

It is an arithmetic number, because the mean of its divisors is an integer number (50779312311).

Almost surely, 2^202001220221 is an apocalyptic number.

It is an amenable number.

202001220221 is a deficient number, since it is larger than the sum of its proper divisors (1116029023).

202001220221 is a wasteful number, since it uses less digits than its factorization.

202001220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116029022.

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

Adding to 202001220221 its reverse (122022100202), we get a palindrome (324023320423).

It can be divided in two parts, 20200 and 1220221, that added together give a palindrome (1240421).

The spelling of 202001220221 in words is "two hundred two billion, one million, two hundred twenty thousand, two hundred twenty-one".