1221202300 has 72 divisors (see below), whose sum is σ = 2715044976. Its totient is φ = 476636160.

The previous prime is 1221202291. The next prime is 1221202321. The reversal of 1221202300 is 32021221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 756294 + ... + 757906.

It is an arithmetic number, because the mean of its divisors is an integer number (37708958).

Almost surely, 2^1221202300 is an apocalyptic number.

1221202300 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 1221202300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1357522488).

1221202300 is an abundant number, since it is smaller than the sum of its proper divisors (1493842676).

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

1221202300 is a wasteful number, since it uses less digits than its factorization.

1221202300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807 (or 1800 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1221202300 is about 34945.7050293738. The cubic root of 1221202300 is about 1068.8806240033.

Adding to 1221202300 its reverse (32021221), we get a palindrome (1253223521).

The spelling of 1221202300 in words is "one billion, two hundred twenty-one million, two hundred two thousand, three hundred".