1221220200203 has 4 divisors (see below), whose sum is σ = 1221825665880. Its totient is φ = 1220614734528.

The previous prime is 1221220200191. The next prime is 1221220200251. The reversal of 1221220200203 is 3020020221221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221220200203 - 2²⁰ = 1221219151627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221220200253) 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, 302729813 + ... + 302733846.

It is an arithmetic number, because the mean of its divisors is an integer number (305456416470).

Almost surely, 2^{1221220200203} is an apocalyptic number.

1221220200203 is a deficient number, since it is larger than the sum of its proper divisors (605465677).

1221220200203 is an equidigital number, since it uses as much as digits as its factorization.

1221220200203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605465676.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 1221220200203 its reverse (3020020221221), we get a palindrome (4241240421424).

The spelling of 1221220200203 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred thousand, two hundred three".