1221321131203 has 4 divisors (see below), whose sum is σ = 1285601190760. Its totient is φ = 1157041071648.

The previous prime is 1221321131167. The next prime is 1221321131269. The reversal of 1221321131203 is 3021311231221.

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 1221321131203 - 2¹⁷ = 1221321000131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221321131293) 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, 32140029750 + ... + 32140029787.

It is an arithmetic number, because the mean of its divisors is an integer number (321400297690).

Almost surely, 2^{1221321131203} is an apocalyptic number.

1221321131203 is a deficient number, since it is larger than the sum of its proper divisors (64280059557).

1221321131203 is an equidigital number, since it uses as much as digits as its factorization.

1221321131203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64280059556.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1221321131203 its reverse (3021311231221), we get a palindrome (4242632362424).

The spelling of 1221321131203 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-one million, one hundred thirty-one thousand, two hundred three".