100120010120021 has 4 divisors (see below), whose sum is σ = 100241958976044. Its totient is φ = 99998061264000.

The previous prime is 100120010119991. The next prime is 100120010120023. The reversal of 100120010120021 is 120021010021001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64761692926225 + 35358317193796 = 8047465^2 + 5946286^2 .

It is a cyclic number.

It is not a de Polignac number, because 100120010120021 - 2⁴⁶ = 29751265942357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100120010119984 and 100120010120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100120010120023) by changing a digit.

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, 60974426780 + ... + 60974428421.

It is an arithmetic number, because the mean of its divisors is an integer number (25060489744011).

Almost surely, 2^{100120010120021} is an apocalyptic number.

It is an amenable number.

100120010120021 is a deficient number, since it is larger than the sum of its proper divisors (121948856023).

100120010120021 is an equidigital number, since it uses as much as digits as its factorization.

100120010120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121948856022.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 100120010120021 its reverse (120021010021001), we get a palindrome (220141020141022).

The spelling of 100120010120021 in words is "one hundred trillion, one hundred twenty billion, ten million, one hundred twenty thousand, twenty-one".