201220011221 has 4 divisors (see below), whose sum is σ = 201283271244. Its totient is φ = 201156751200.

The previous prime is 201220011217. The next prime is 201220011227. The reversal of 201220011221 is 122110022102.

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 42326890225 + 158893120996 = 205735^2 + 398614^2 .

It is a cyclic number.

It is not a de Polignac number, because 201220011221 - 2² = 201220011217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201220011196 and 201220011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220011227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31625240 + ... + 31631601.

It is an arithmetic number, because the mean of its divisors is an integer number (50320817811).

Almost surely, 2^201220011221 is an apocalyptic number.

It is an amenable number.

201220011221 is a deficient number, since it is larger than the sum of its proper divisors (63260023).

201220011221 is an equidigital number, since it uses as much as digits as its factorization.

201220011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63260022.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201220011221 its reverse (122110022102), we get a palindrome (323330033323).

The spelling of 201220011221 in words is "two hundred one billion, two hundred twenty million, eleven thousand, two hundred twenty-one".