1221211210203 has 6 divisors (see below), whose sum is σ = 1763971748084. Its totient is φ = 814140806796.

The previous prime is 1221211210103. The next prime is 1221211210273. The reversal of 1221211210203 is 3020121121221.

1221211210203 is a `hidden beast` number, since 1 + 221 + 211 + 210 + 20 + 3 = 666.

It is not a de Polignac number, because 1221211210203 - 2¹⁶ = 1221211144667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221211210273) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67845067225 + ... + 67845067242.

Almost surely, 2^{1221211210203} is an apocalyptic number.

1221211210203 is a deficient number, since it is larger than the sum of its proper divisors (542760537881).

1221211210203 is a wasteful number, since it uses less digits than its factorization.

1221211210203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135690134473 (or 135690134470 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1221211210203 its reverse (3020121121221), we get a palindrome (4241332331424).

The spelling of 1221211210203 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred ten thousand, two hundred three".