1221450204 has 144 divisors (see below), whose sum is σ = 3320352000. Its totient is φ = 348042240.

The previous prime is 1221450203. The next prime is 1221450211. The reversal of 1221450204 is 4020541221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221450203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2447547 + ... + 2448045.

It is an arithmetic number, because the mean of its divisors is an integer number (23058000).

Almost surely, 2^1221450204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221450204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1660176000).

1221450204 is an abundant number, since it is smaller than the sum of its proper divisors (2098901796).

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

1221450204 is a wasteful number, since it uses less digits than its factorization.

1221450204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620 (or 605 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1221450204 is about 34949.2518374857. The cubic root of 1221450204 is about 1068.9529466791.

Adding to 1221450204 its reverse (4020541221), we get a palindrome (5241991425).

The spelling of 1221450204 in words is "one billion, two hundred twenty-one million, four hundred fifty thousand, two hundred four".