1221313004 has 12 divisors (see below), whose sum is σ = 2187002664. Its totient is φ = 596455104.

The previous prime is 1221312977. The next prime is 1221313007. The reversal of 1221313004 is 4003131221.

It is not an unprimeable number, because it can be changed into a prime (1221313007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3550157 + ... + 3550500.

It is an arithmetic number, because the mean of its divisors is an integer number (182250222).

Almost surely, 2^1221313004 is an apocalyptic number.

It is an amenable number.

1221313004 is a deficient number, since it is larger than the sum of its proper divisors (965689660).

1221313004 is a wasteful number, since it uses less digits than its factorization.

1221313004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7100704 (or 7100702 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1221313004 is about 34947.2889363395. The cubic root of 1221313004 is about 1068.9129216238.

Adding to 1221313004 its reverse (4003131221), we get a palindrome (5224444225).

The spelling of 1221313004 in words is "one billion, two hundred twenty-one million, three hundred thirteen thousand, four".