100121021120020 has 12 divisors (see below), whose sum is σ = 210254144352084. Its totient is φ = 40048408448000.

The previous prime is 100121021119997. The next prime is 100121021120027. The reversal of 100121021120020 is 20021120121001.

It can be written as a sum of positive squares in 2 ways, for example, as 17848901241616 + 82272119878404 = 4224796^2 + 9070398^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121021120027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2503025527981 + ... + 2503025528020.

It is an arithmetic number, because the mean of its divisors is an integer number (17521178696007).

Almost surely, 2^{100121021120020} is an apocalyptic number.

100121021120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100121021120020 is an abundant number, since it is smaller than the sum of its proper divisors (110133123232064).

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

100121021120020 is a wasteful number, since it uses less digits than its factorization.

100121021120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5006051056010 (or 5006051056008 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 100121021120020 its reverse (20021120121001), we get a palindrome (120142141241021).

The spelling of 100121021120020 in words is "one hundred trillion, one hundred twenty-one billion, twenty-one million, one hundred twenty thousand, twenty".