1221043400303 has 8 divisors (see below), whose sum is σ = 1241723935296. Its totient is φ = 1200384266400.

The previous prime is 1221043400281. The next prime is 1221043400323. The reversal of 1221043400303 is 3030043401221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221043400303 - 2²⁶ = 1220976291439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221043400323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5235176 + ... + 5463437.

It is an arithmetic number, because the mean of its divisors is an integer number (155215491912).

Almost surely, 2^{1221043400303} is an apocalyptic number.

1221043400303 is a deficient number, since it is larger than the sum of its proper divisors (20680534993).

1221043400303 is a wasteful number, since it uses less digits than its factorization.

1221043400303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10700545.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 1221043400303 its reverse (3030043401221), we get a palindrome (4251086801524).

The spelling of 1221043400303 in words is "one trillion, two hundred twenty-one billion, forty-three million, four hundred thousand, three hundred three".