1221003033123 has 4 divisors (see below), whose sum is σ = 1628004044168. Its totient is φ = 814002022080.

The previous prime is 1221003033119. The next prime is 1221003033157. The reversal of 1221003033123 is 3213303001221.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1221003033123 - 2² = 1221003033119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221003033123.

It is not an unprimeable number, because it can be changed into a prime (1221003033113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203500505518 + ... + 203500505523.

It is an arithmetic number, because the mean of its divisors is an integer number (407001011042).

Almost surely, 2^{1221003033123} is an apocalyptic number.

1221003033123 is a deficient number, since it is larger than the sum of its proper divisors (407001011045).

1221003033123 is an equidigital number, since it uses as much as digits as its factorization.

1221003033123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407001011044.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 1221003033123 its reverse (3213303001221), we get a palindrome (4434306034344).

The spelling of 1221003033123 in words is "one trillion, two hundred twenty-one billion, three million, thirty-three thousand, one hundred twenty-three".