100121020020 has 144 divisors (see below), whose sum is σ = 347204527488. Its totient is φ = 22877003520.

The previous prime is 100121020003. The next prime is 100121020033. The reversal of 100121020020 is 20020121001.

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 = 100121019984 and 100121020011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4205350 + ... + 4229090.

It is an arithmetic number, because the mean of its divisors is an integer number (2411142552).

Almost surely, 2^100121020020 is an apocalyptic number.

100121020020 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 100121020020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173602263744).

100121020020 is an abundant number, since it is smaller than the sum of its proper divisors (247083507468).

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

100121020020 is a wasteful number, since it uses less digits than its factorization.

100121020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27110 (or 27105 counting only the distinct ones).

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

Adding to 100121020020 its reverse (20020121001), we get a palindrome (120141141021).

The spelling of 100121020020 in words is "one hundred billion, one hundred twenty-one million, twenty thousand, twenty".