201221011 has 2 divisors, whose sum is σ = 201221012. Its totient is φ = 201221010.

The previous prime is 201221003. The next prime is 201221017. The reversal of 201221011 is 110122102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201221011 - 2³ = 201221003 is a prime.

It is not a weakly prime, because it can be changed into another prime (201221017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610505 + 100610506.

It is an arithmetic number, because the mean of its divisors is an integer number (100610506).

Almost surely, 2^201221011 is an apocalyptic number.

201221011 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221011 is an equidigital number, since it uses as much as digits as its factorization.

201221011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 201221011 is about 14185.2391943175. The cubic root of 201221011 is about 585.9912199176.

Adding to 201221011 its reverse (110122102), we get a palindrome (311343113).

It can be divided in two parts, 20122101 and 1, that added together give a palindrome (20122102).

The spelling of 201221011 in words is "two hundred one million, two hundred twenty-one thousand, eleven".