1221544224403 has 2 divisors, whose sum is σ = 1221544224404. Its totient is φ = 1221544224402.

The previous prime is 1221544224389. The next prime is 1221544224449. The reversal of 1221544224403 is 3044224451221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221544224403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221544222403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610772112201 + 610772112202.

It is an arithmetic number, because the mean of its divisors is an integer number (610772112202).

Almost surely, 2^{1221544224403} is an apocalyptic number.

1221544224403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221544224403 is an equidigital number, since it uses as much as digits as its factorization.

1221544224403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61440, while the sum is 34.

Adding to 1221544224403 its reverse (3044224451221), we get a palindrome (4265768675624).

The spelling of 1221544224403 in words is "one trillion, two hundred twenty-one billion, five hundred forty-four million, two hundred twenty-four thousand, four hundred three".