1221047304 has 32 divisors (see below), whose sum is σ = 3232185120. Its totient is φ = 383073536.

The previous prime is 1221047297. The next prime is 1221047327. The reversal of 1221047304 is 4037401221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1495974 + ... + 1496789.

It is an arithmetic number, because the mean of its divisors is an integer number (101005785).

Almost surely, 2^1221047304 is an apocalyptic number.

It is an amenable number.

1221047304 is an abundant number, since it is smaller than the sum of its proper divisors (2011137816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221047304 is a wasteful number, since it uses less digits than its factorization.

1221047304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992789 (or 2992785 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 1221047304 is about 34943.4872901947. The cubic root of 1221047304 is about 1068.8354010208.

Adding to 1221047304 its reverse (4037401221), we get a palindrome (5258448525).

The spelling of 1221047304 in words is "one billion, two hundred twenty-one million, forty-seven thousand, three hundred four".