1211221303 has 8 divisors (see below), whose sum is σ = 1241379216. Its totient is φ = 1181092800.

The previous prime is 1211221237. The next prime is 1211221309. The reversal of 1211221303 is 3031221121.

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 1211221303 - 2¹³ = 1211213111 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 (1211221309) 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, 92725 + ... + 104977.

It is an arithmetic number, because the mean of its divisors is an integer number (155172402).

Almost surely, 2^1211221303 is an apocalyptic number.

1211221303 is a deficient number, since it is larger than the sum of its proper divisors (30157913).

1211221303 is a wasteful number, since it uses less digits than its factorization.

1211221303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14705.

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

The square root of 1211221303 is about 34802.6048306732. The cubic root of 1211221303 is about 1065.9606350018.

Adding to 1211221303 its reverse (3031221121), we get a palindrome (4242442424).

The spelling of 1211221303 in words is "one billion, two hundred eleven million, two hundred twenty-one thousand, three hundred three".