1210002120120 has 128 divisors (see below), whose sum is σ = 3709589529600. Its totient is φ = 315601875456.

The previous prime is 1210002120079. The next prime is 1210002120139. The reversal of 1210002120120 is 210212000121.

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 = 1210002120096 and 1210002120105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8939911 + ... + 9074249.

It is an arithmetic number, because the mean of its divisors is an integer number (28981168200).

Almost surely, 2^{1210002120120} is an apocalyptic number.

1210002120120 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 1210002120120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1854794764800).

1210002120120 is an abundant number, since it is smaller than the sum of its proper divisors (2499587409480).

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

1210002120120 is a wasteful number, since it uses less digits than its factorization.

1210002120120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135997 (or 135993 counting only the distinct ones).

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

Adding to 1210002120120 its reverse (210212000121), we get a palindrome (1420214120241).

The spelling of 1210002120120 in words is "one trillion, two hundred ten billion, two million, one hundred twenty thousand, one hundred twenty".