1221203204 has 96 divisors (see below), whose sum is σ = 2460610656. Its totient is φ = 526417920.

The previous prime is 1221203201. The next prime is 1221203233. The reversal of 1221203204 is 4023021221.

It can be written as a sum of positive squares in 16 ways, for example, as 778521604 + 442681600 = 27902^2 + 21040^2 .

It is not an unprimeable number, because it can be changed into a prime (1221203201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8913824 + ... + 8913960.

It is an arithmetic number, because the mean of its divisors is an integer number (25631361).

Almost surely, 2^1221203204 is an apocalyptic number.

It is an amenable number.

1221203204 is an abundant number, since it is smaller than the sum of its proper divisors (1239407452).

1221203204 is a wasteful number, since it uses less digits than its factorization.

1221203204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1221203204 is about 34945.7179637220. The cubic root of 1221203204 is about 1068.8808877510.

Adding to 1221203204 its reverse (4023021221), we get a palindrome (5244224425).

The spelling of 1221203204 in words is "one billion, two hundred twenty-one million, two hundred three thousand, two hundred four".