20112120100021 has 8 divisors (see below), whose sum is σ = 20291637342744. Its totient is φ = 19932629767680.

The previous prime is 20112120100019. The next prime is 20112120100031. The reversal of 20112120100021 is 12000102121102.

It can be written as a sum of positive squares in 4 ways, for example, as 854679911121 + 19257440188900 = 924489^2 + 4388330^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20112120100021 - 2¹ = 20112120100019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112120099974 and 20112120100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112120100031) 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 7 ways as a sum of consecutive naturals, for example, 5224686 + ... + 8217151.

It is an arithmetic number, because the mean of its divisors is an integer number (2536454667843).

Almost surely, 2^{20112120100021} is an apocalyptic number.

It is an amenable number.

20112120100021 is a deficient number, since it is larger than the sum of its proper divisors (179517242723).

20112120100021 is a wasteful number, since it uses less digits than its factorization.

20112120100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13455191.

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

Adding to 20112120100021 its reverse (12000102121102), we get a palindrome (32112222221123).

The spelling of 20112120100021 in words is "twenty trillion, one hundred twelve billion, one hundred twenty million, one hundred thousand, twenty-one".