1221100303 has 8 divisors (see below), whose sum is σ = 1329692400. Its totient is φ = 1116940608.

The previous prime is 1221100277. The next prime is 1221100339. The reversal of 1221100303 is 3030011221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221100303 - 2⁹ = 1221099791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221100343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1107526 + ... + 1108627.

It is an arithmetic number, because the mean of its divisors is an integer number (166211550).

Almost surely, 2^1221100303 is an apocalyptic number.

1221100303 is a deficient number, since it is larger than the sum of its proper divisors (108592097).

1221100303 is a wasteful number, since it uses less digits than its factorization.

1221100303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216201.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1221100303 is about 34944.2456350112. The cubic root of 1221100303 is about 1068.8508649010.

Adding to 1221100303 its reverse (3030011221), we get a palindrome (4251111524).

The spelling of 1221100303 in words is "one billion, two hundred twenty-one million, one hundred thousand, three hundred three".