20011002111021 has 8 divisors (see below), whose sum is σ = 26682874844704. Its totient is φ = 13339898725680.

The previous prime is 20011002111017. The next prime is 20011002111049. The reversal of 20011002111021 is 12011120011002.

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

It is not a de Polignac number, because 20011002111021 - 2² = 20011002111017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20011002110988 and 20011002111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011002111011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192276391 + ... + 192380436.

It is an arithmetic number, because the mean of its divisors is an integer number (3335359355588).

Almost surely, 2^{20011002111021} is an apocalyptic number.

It is an amenable number.

20011002111021 is a deficient number, since it is larger than the sum of its proper divisors (6671872733683).

20011002111021 is a wasteful number, since it uses less digits than its factorization.

20011002111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384674171.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20011002111021 its reverse (12011120011002), we get a palindrome (32022122122023).

The spelling of 20011002111021 in words is "twenty trillion, eleven billion, two million, one hundred eleven thousand, twenty-one".