2001221002213 has 2 divisors, whose sum is σ = 2001221002214. Its totient is φ = 2001221002212.

The previous prime is 2001221002189. The next prime is 2001221002217. The reversal of 2001221002213 is 3122001221002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1409555439009 + 591665563204 = 1187247^2 + 769198^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001221002213 - 2²¹ = 2001218905061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001221002217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000610501106 + 1000610501107.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610501107).

Almost surely, 2^{2001221002213} is an apocalyptic number.

It is an amenable number.

2001221002213 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001221002213 is an equidigital number, since it uses as much as digits as its factorization.

2001221002213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 2001221002213 its reverse (3122001221002), we get a palindrome (5123222223215).

It can be divided in two parts, 20012 and 21002213, that added together give a square (21022225 = 4585²).

The spelling of 2001221002213 in words is "two trillion, one billion, two hundred twenty-one million, two thousand, two hundred thirteen".