1212221300 has 72 divisors (see below), whose sum is σ = 2692140192. Its totient is φ = 473616000.

The previous prime is 1212221287. The next prime is 1212221323. The reversal of 1212221300 is 31222121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1753955 + ... + 1754645.

It is an arithmetic number, because the mean of its divisors is an integer number (37390836).

Almost surely, 2^1212221300 is an apocalyptic number.

1212221300 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 1212221300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1346070096).

1212221300 is an abundant number, since it is smaller than the sum of its proper divisors (1479918892).

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

1212221300 is a wasteful number, since it uses less digits than its factorization.

1212221300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089 (or 1082 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1212221300 is about 34816.9685641929. The cubic root of 1212221300 is about 1066.2539103963.

Adding to 1212221300 its reverse (31222121), we get a palindrome (1243443421).

The spelling of 1212221300 in words is "one billion, two hundred twelve million, two hundred twenty-one thousand, three hundred".