1221203300 has 72 divisors (see below), whose sum is σ = 2692536000. Its totient is φ = 480712320.

The previous prime is 1221203297. The next prime is 1221203309. The reversal of 1221203300 is 33021221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1221203309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2168819 + ... + 2169381.

Almost surely, 2^1221203300 is an apocalyptic number.

1221203300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221203300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1346268000).

1221203300 is an abundant number, since it is smaller than the sum of its proper divisors (1471332700).

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

1221203300 is a wasteful number, since it uses less digits than its factorization.

1221203300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885 (or 878 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1221203300 is about 34945.7193372808. The cubic root of 1221203300 is about 1068.8809157596.

Adding to 1221203300 its reverse (33021221), we get a palindrome (1254224521).

The spelling of 1221203300 in words is "one billion, two hundred twenty-one million, two hundred three thousand, three hundred".