201221002013 has 2 divisors, whose sum is σ = 201221002014. Its totient is φ = 201221002012.

The previous prime is 201221002009. The next prime is 201221002033. The reversal of 201221002013 is 310200122102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201010548964 + 210453049 = 448342^2 + 14507^2 .

It is a cyclic number.

It is not a de Polignac number, because 201221002013 - 2² = 201221002009 is a prime.

It is a super-2 number, since 2×201221002013² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201221002033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610501006 + 100610501007.

It is an arithmetic number, because the mean of its divisors is an integer number (100610501007).

Almost surely, 2^201221002013 is an apocalyptic number.

It is an amenable number.

201221002013 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221002013 is an equidigital number, since it uses as much as digits as its factorization.

201221002013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 201221002013 its reverse (310200122102), we get a palindrome (511421124115).

The spelling of 201221002013 in words is "two hundred one billion, two hundred twenty-one million, two thousand, thirteen".