1221244243403 has 2 divisors, whose sum is σ = 1221244243404. Its totient is φ = 1221244243402.

The previous prime is 1221244243397. The next prime is 1221244243433. The reversal of 1221244243403 is 3043424421221.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3043424421221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221244243403 - 2³⁶ = 1152524766667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221244243403.

It is not a weakly prime, because it can be changed into another prime (1221244243433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610622121701 + 610622121702.

It is an arithmetic number, because the mean of its divisors is an integer number (610622121702).

Almost surely, 2^{1221244243403} is an apocalyptic number.

1221244243403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221244243403 is an equidigital number, since it uses as much as digits as its factorization.

1221244243403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 1221244243403 its reverse (3043424421221), we get a palindrome (4264668664624).

The spelling of 1221244243403 in words is "one trillion, two hundred twenty-one billion, two hundred forty-four million, two hundred forty-three thousand, four hundred three".