1212342120 has 512 divisors, whose sum is σ = 4790016000. Its totient is φ = 269568000.

The previous prime is 1212342113. The next prime is 1212342149. The reversal of 1212342120 is 212432121.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1212342093 and 1212342102.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9254455 + ... + 9254585.

It is an arithmetic number, because the mean of its divisors is an integer number (9355500).

Almost surely, 2^1212342120 is an apocalyptic number.

1212342120 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 1212342120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2395008000).

1212342120 is an abundant number, since it is smaller than the sum of its proper divisors (3577673880).

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

1212342120 is a wasteful number, since it uses less digits than its factorization.

1212342120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1212342120 is about 34818.7035944763. The cubic root of 1212342120 is about 1066.2893331138.

Adding to 1212342120 its reverse (212432121), we get a palindrome (1424774241).

Subtracting from 1212342120 its reverse (212432121), we obtain a palindrome (999909999).

The spelling of 1212342120 in words is "one billion, two hundred twelve million, three hundred forty-two thousand, one hundred twenty".