1212200120 has 32 divisors (see below), whose sum is σ = 2728462320. Its totient is φ = 484700160.

The previous prime is 1212200107. The next prime is 1212200123. The reversal of 1212200120 is 210022121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212200123) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 175859 + ... + 182621.

Almost surely, 2^1212200120 is an apocalyptic number.

1212200120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212200120 is an abundant number, since it is smaller than the sum of its proper divisors (1516262200).

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

1212200120 is a wasteful number, since it uses less digits than its factorization.

1212200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11255 (or 11251 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1212200120 is about 34816.6644008297. The cubic root of 1212200120 is about 1066.2477004770.

Adding to 1212200120 its reverse (210022121), we get a palindrome (1422222241).

The spelling of 1212200120 in words is "one billion, two hundred twelve million, two hundred thousand, one hundred twenty".