1213811200 has 480 divisors, whose sum is σ = 3896893440. Its totient is φ = 364953600.

The previous prime is 1213811197. The next prime is 1213811213. The reversal of 1213811200 is 21183121.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39155185 + ... + 39155215.

It is an arithmetic number, because the mean of its divisors is an integer number (8118528).

Almost surely, 2^1213811200 is an apocalyptic number.

1213811200 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 1213811200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1948446720).

1213811200 is an abundant number, since it is smaller than the sum of its proper divisors (2683082240).

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

1213811200 is a wasteful number, since it uses less digits than its factorization.

1213811200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1213811200 is about 34839.7933403745. The cubic root of 1213811200 is about 1066.7198584585.

Adding to 1213811200 its reverse (21183121), we get a palindrome (1234994321).

The spelling of 1213811200 in words is "one billion, two hundred thirteen million, eight hundred eleven thousand, two hundred".