1212110400 has 168 divisors, whose sum is σ = 4037157280. Its totient is φ = 318320640.

The previous prime is 1212110399. The next prime is 1212110407. The reversal of 1212110400 is 40112121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (1212110407) by changing a digit.

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, 319716 + ... + 323484.

Almost surely, 2^1212110400 is an apocalyptic number.

1212110400 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 1212110400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2018578640).

1212110400 is an abundant number, since it is smaller than the sum of its proper divisors (2825046880).

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

1212110400 is a wasteful number, since it uses less digits than its factorization.

1212110400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3861 (or 3846 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1212110400 is about 34815.3759135242. The cubic root of 1212110400 is about 1066.2213940110.

Adding to 1212110400 its reverse (40112121), we get a palindrome (1252222521).

The spelling of 1212110400 in words is "one billion, two hundred twelve million, one hundred ten thousand, four hundred".