1221202021203 has 24 divisors (see below), whose sum is σ = 1854349068208. Its totient is φ = 802982139264.

The previous prime is 1221202021201. The next prime is 1221202021271. The reversal of 1221202021203 is 3021202021221.

It is not a de Polignac number, because 1221202021203 - 2¹ = 1221202021201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221202021201) 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 in 23 ways as a sum of consecutive naturals, for example, 34403650 + ... + 34439127.

Almost surely, 2^{1221202021203} is an apocalyptic number.

1221202021203 is a deficient number, since it is larger than the sum of its proper divisors (633147047005).

1221202021203 is an frugal number, since it uses more digits than its factorization.

1221202021203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68842865 (or 68842853 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 1221202021203 its sum of digits (18), we get a palindrome (1221202021221).

Adding to 1221202021203 its reverse (3021202021221), we get a palindrome (4242404042424).

The spelling of 1221202021203 in words is "one trillion, two hundred twenty-one billion, two hundred two million, twenty-one thousand, two hundred three".