100121010020 has 12 divisors (see below), whose sum is σ = 210254121084. Its totient is φ = 40048404000.

The previous prime is 100121010019. The next prime is 100121010047. The reversal of 100121010020 is 20010121001.

It can be written as a sum of positive squares in 2 ways, for example, as 11517153124 + 88603856896 = 107318^2 + 297664^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2503025231 + ... + 2503025270.

It is an arithmetic number, because the mean of its divisors is an integer number (17521176757).

Almost surely, 2^100121010020 is an apocalyptic number.

100121010020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100121010020 is an abundant number, since it is smaller than the sum of its proper divisors (110133111064).

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

100121010020 is a wasteful number, since it uses less digits than its factorization.

100121010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5006050510 (or 5006050508 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 100121010020 its reverse (20010121001), we get a palindrome (120131131021).

The spelling of 100121010020 in words is "one hundred billion, one hundred twenty-one million, ten thousand, twenty".