1211221304 has 32 divisors (see below), whose sum is σ = 2415193200. Its totient is φ = 567482880.

The previous prime is 1211221237. The next prime is 1211221309. The reversal of 1211221304 is 4031221121.

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 11699 + ... + 50589.

Almost surely, 2^1211221304 is an apocalyptic number.

It is an amenable number.

1211221304 is a deficient number, since it is larger than the sum of its proper divisors (1203971896).

1211221304 is a wasteful number, since it uses less digits than its factorization.

1211221304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39143 (or 39139 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1211221304 is about 34802.6048450400. The cubic root of 1211221304 is about 1065.9606352952.

Adding to 1211221304 its reverse (4031221121), we get a palindrome (5242442425).

The spelling of 1211221304 in words is "one billion, two hundred eleven million, two hundred twenty-one thousand, three hundred four".