1221012231203 has 4 divisors (see below), whose sum is σ = 1223926341960. Its totient is φ = 1218098120448.

The previous prime is 1221012231191. The next prime is 1221012231209. The reversal of 1221012231203 is 3021322101221.

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 1221012231203 - 2⁶ = 1221012231139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221012231209) 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, 1457054750 + ... + 1457055587.

It is an arithmetic number, because the mean of its divisors is an integer number (305981585490).

Almost surely, 2^{1221012231203} is an apocalyptic number.

1221012231203 is a deficient number, since it is larger than the sum of its proper divisors (2914110757).

1221012231203 is an equidigital number, since it uses as much as digits as its factorization.

1221012231203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2914110756.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1221012231203 its reverse (3021322101221), we get a palindrome (4242334332424).

The spelling of 1221012231203 in words is "one trillion, two hundred twenty-one billion, twelve million, two hundred thirty-one thousand, two hundred three".