1221100032303 has 48 divisors (see below), whose sum is σ = 1828677371040. Its totient is φ = 784685121792.

The previous prime is 1221100032293. The next prime is 1221100032329. The reversal of 1221100032303 is 3032300011221.

It is not a de Polignac number, because 1221100032303 - 2⁹ = 1221100031791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221100034303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48759301 + ... + 48784337.

It is an arithmetic number, because the mean of its divisors is an integer number (38097445230).

Almost surely, 2^{1221100032303} is an apocalyptic number.

1221100032303 is a deficient number, since it is larger than the sum of its proper divisors (607577338737).

1221100032303 is a wasteful number, since it uses less digits than its factorization.

1221100032303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26888 (or 26885 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 1221100032303 its reverse (3032300011221), we get a palindrome (4253400043524).

The spelling of 1221100032303 in words is "one trillion, two hundred twenty-one billion, one hundred million, thirty-two thousand, three hundred three".