1221211303 has 32 divisors (see below), whose sum is σ = 1444262400. Its totient is φ = 1021870080.

The previous prime is 1221211291. The next prime is 1221211331. The reversal of 1221211303 is 3031121221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221211303 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 (1221211333) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2719623 + ... + 2720071.

It is an arithmetic number, because the mean of its divisors is an integer number (45133200).

Almost surely, 2^1221211303 is an apocalyptic number.

1221211303 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221211303 is a deficient number, since it is larger than the sum of its proper divisors (223051097).

1221211303 is a wasteful number, since it uses less digits than its factorization.

1221211303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1221211303 is about 34945.8338432495. The cubic root of 1221211303 is about 1068.8832506794.

Adding to 1221211303 its reverse (3031121221), we get a palindrome (4252332524).

The spelling of 1221211303 in words is "one billion, two hundred twenty-one million, two hundred eleven thousand, three hundred three".