1221442440203 has 2 divisors, whose sum is σ = 1221442440204. Its totient is φ = 1221442440202.

The previous prime is 1221442440193. The next prime is 1221442440319. The reversal of 1221442440203 is 3020442441221.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3020442441221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221442440203 - 2³⁶ = 1152722963467 is a prime.

It is a super-3 number, since 3×1221442440203³ (a number of 37 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1221442442203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610721220101 + 610721220102.

It is an arithmetic number, because the mean of its divisors is an integer number (610721220102).

Almost surely, 2^{1221442440203} is an apocalyptic number.

1221442440203 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221442440203 is an equidigital number, since it uses as much as digits as its factorization.

1221442440203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 1221442440203 its reverse (3020442441221), we get a palindrome (4241884881424).

The spelling of 1221442440203 in words is "one trillion, two hundred twenty-one billion, four hundred forty-two million, four hundred forty thousand, two hundred three".