1921440212201 has 2 divisors, whose sum is σ = 1921440212202. Its totient is φ = 1921440212200.

The previous prime is 1921440212183. The next prime is 1921440212213. The reversal of 1921440212201 is 1022120441291.

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., 1665328306576 + 256111905625 = 1290476^2 + 506075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1921440212201 - 2¹⁰ = 1921440211177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1921440212231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960720106100 + 960720106101.

It is an arithmetic number, because the mean of its divisors is an integer number (960720106101).

Almost surely, 2^{1921440212201} is an apocalyptic number.

It is an amenable number.

1921440212201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921440212201 is an equidigital number, since it uses as much as digits as its factorization.

1921440212201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

Adding to 1921440212201 its reverse (1022120441291), we get a palindrome (2943560653492).

The spelling of 1921440212201 in words is "one trillion, nine hundred twenty-one billion, four hundred forty million, two hundred twelve thousand, two hundred one".