1212000020221 has 2 divisors, whose sum is σ = 1212000020222. Its totient is φ = 1212000020220.

The previous prime is 1212000020213. The next prime is 1212000020281. The reversal of 1212000020221 is 1220200002121.

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., 945005628996 + 266994391225 = 972114^2 + 516715^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212000020221 - 2³ = 1212000020213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212000020281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606000010110 + 606000010111.

It is an arithmetic number, because the mean of its divisors is an integer number (606000010111).

Almost surely, 2^{1212000020221} is an apocalyptic number.

It is an amenable number.

1212000020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212000020221 is an equidigital number, since it uses as much as digits as its factorization.

1212000020221 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 13.

Adding to 1212000020221 its reverse (1220200002121), we get a palindrome (2432200022342).

The spelling of 1212000020221 in words is "one trillion, two hundred twelve billion, twenty thousand, two hundred twenty-one".