201221201212001 has 2 divisors, whose sum is σ = 201221201212002. Its totient is φ = 201221201212000.

The previous prime is 201221201211997. The next prime is 201221201212049. The reversal of 201221201212001 is 100212102122102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108780206550625 + 92440994661376 = 10429775^2 + 9614624^2 .

It is a cyclic number.

It is not a de Polignac number, because 201221201212001 - 2² = 201221201211997 is a prime.

It is a super-2 number, since 2×201221201212001² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201221201212601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610600606000 + 100610600606001.

It is an arithmetic number, because the mean of its divisors is an integer number (100610600606001).

Almost surely, 2^{201221201212001} is an apocalyptic number.

It is an amenable number.

201221201212001 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221201212001 is an equidigital number, since it uses as much as digits as its factorization.

201221201212001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 201221201212001 its reverse (100212102122102), we get a palindrome (301433303334103).

The spelling of 201221201212001 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred one million, two hundred twelve thousand, one".