1200001212120 has 128 divisors (see below), whose sum is σ = 3752927354880. Its totient is φ = 306611520000.

The previous prime is 1200001212103. The next prime is 1200001212121. The reversal of 1200001212120 is 212121000021.

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

It is a junction number, because it is equal to n+sod(n) for n = 1200001212096 and 1200001212105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200001212121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1221216 + ... + 1972655.

It is an arithmetic number, because the mean of its divisors is an integer number (29319744960).

Almost surely, 2^{1200001212120} is an apocalyptic number.

1200001212120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200001212120 is an abundant number, since it is smaller than the sum of its proper divisors (2552926142760).

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

1200001212120 is a wasteful number, since it uses less digits than its factorization.

1200001212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194017 (or 3194013 counting only the distinct ones).

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

Adding to 1200001212120 its reverse (212121000021), we get a palindrome (1412122212141).

The spelling of 1200001212120 in words is "one trillion, two hundred billion, one million, two hundred twelve thousand, one hundred twenty".