1221200120003 has 2 divisors, whose sum is σ = 1221200120004. Its totient is φ = 1221200120002.

The previous prime is 1221200119999. The next prime is 1221200120017. The reversal of 1221200120003 is 3000210021221.

It is a happy number.

It is an a-pointer prime, because the next prime (1221200120017) can be obtained adding 1221200120003 to its sum of digits (14).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221200120003 - 2² = 1221200119999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221200120003.

It is not a weakly prime, because it can be changed into another prime (1221200120303) 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, 610600060001 + 610600060002.

It is an arithmetic number, because the mean of its divisors is an integer number (610600060002).

Almost surely, 2^{1221200120003} is an apocalyptic number.

1221200120003 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221200120003 is an equidigital number, since it uses as much as digits as its factorization.

1221200120003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1221200120003 its reverse (3000210021221), we get a palindrome (4221410141224).

The spelling of 1221200120003 in words is "one trillion, two hundred twenty-one billion, two hundred million, one hundred twenty thousand, three".