2001012120221 has 2 divisors, whose sum is σ = 2001012120222. Its totient is φ = 2001012120220.

The previous prime is 2001012120209. The next prime is 2001012120259. The reversal of 2001012120221 is 1220212101002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1406925727321 + 594086392900 = 1186139^2 + 770770^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001012120221 - 2⁶ = 2001012120157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001012120196 and 2001012120205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001012120421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000506060110 + 1000506060111.

It is an arithmetic number, because the mean of its divisors is an integer number (1000506060111).

Almost surely, 2^{2001012120221} is an apocalyptic number.

It is an amenable number.

2001012120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001012120221 is an equidigital number, since it uses as much as digits as its factorization.

2001012120221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 2001012120221 its reverse (1220212101002), we get a palindrome (3221224221223).

The spelling of 2001012120221 in words is "two trillion, one billion, twelve million, one hundred twenty thousand, two hundred twenty-one".