1221331204 has 12 divisors (see below), whose sum is σ = 2263055004. Its totient is φ = 574744064.

The previous prime is 1221331117. The next prime is 1221331219. The reversal of 1221331204 is 4021331221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 731594304 + 489736900 = 27048^2 + 22130^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8980309 + ... + 8980444.

It is an arithmetic number, because the mean of its divisors is an integer number (188587917).

Almost surely, 2^1221331204 is an apocalyptic number.

It is an amenable number.

1221331204 is a deficient number, since it is larger than the sum of its proper divisors (1041723800).

1221331204 is a wasteful number, since it uses less digits than its factorization.

1221331204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17960774 (or 17960772 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1221331204 is about 34947.5493275280. The cubic root of 1221331204 is about 1068.9182312423.

Adding to 1221331204 its reverse (4021331221), we get a palindrome (5242662425).

The spelling of 1221331204 in words is "one billion, two hundred twenty-one million, three hundred thirty-one thousand, two hundred four".