1021200100120 has 16 divisors (see below), whose sum is σ = 2297700225360. Its totient is φ = 408480040032.

The previous prime is 1021200100069. The next prime is 1021200100147. The reversal of 1021200100120 is 210010021201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1021200100097 and 1021200100106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12765001212 + ... + 12765001291.

It is an arithmetic number, because the mean of its divisors is an integer number (143606264085).

Almost surely, 2^{1021200100120} is an apocalyptic number.

1021200100120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021200100120 is an abundant number, since it is smaller than the sum of its proper divisors (1276500125240).

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

1021200100120 is a wasteful number, since it uses less digits than its factorization.

1021200100120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25530002514 (or 25530002510 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1021200100120 its reverse (210010021201), we get a palindrome (1231210121321).

The spelling of 1021200100120 in words is "one trillion, twenty-one billion, two hundred million, one hundred thousand, one hundred twenty".