100200121020 has 288 divisors, whose sum is σ = 324900576000. Its totient is φ = 24924257280.

The previous prime is 100200121019. The next prime is 100200121033. The reversal of 100200121020 is 20121002001.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 100200120993 and 100200121011.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 62273976 + ... + 62275584.

It is an arithmetic number, because the mean of its divisors is an integer number (1128127000).

Almost surely, 2^100200121020 is an apocalyptic number.

100200121020 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 100200121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162450288000).

100200121020 is an abundant number, since it is smaller than the sum of its proper divisors (224700454980).

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

100200121020 is a wasteful number, since it uses less digits than its factorization.

100200121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913 (or 1908 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 100200121020 its reverse (20121002001), we get a palindrome (120321123021).

The spelling of 100200121020 in words is "one hundred billion, two hundred million, one hundred twenty-one thousand, twenty".