1212123330 has 96 divisors (see below), whose sum is σ = 3531048768. Its totient is φ = 285897600.

The previous prime is 1212123329. The next prime is 1212123337. The reversal of 1212123330 is 333212121.

1212123330 is a `hidden beast` number, since 1 + 212 + 123 + 330 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1212123337) 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 47 ways as a sum of consecutive naturals, for example, 20085 + ... + 53175.

It is an arithmetic number, because the mean of its divisors is an integer number (36781758).

Almost surely, 2^1212123330 is an apocalyptic number.

1212123330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212123330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1765524384).

1212123330 is an abundant number, since it is smaller than the sum of its proper divisors (2318925438).

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

1212123330 is a wasteful number, since it uses less digits than its factorization.

1212123330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33152 (or 33149 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1212123330 is about 34815.5616068447. The cubic root of 1212123330 is about 1066.2251852480.

Adding to 1212123330 its reverse (333212121), we get a palindrome (1545335451).

The spelling of 1212123330 in words is "one billion, two hundred twelve million, one hundred twenty-three thousand, three hundred thirty".