20211100000021 has 8 divisors (see below), whose sum is σ = 23251369537664. Its totient is φ = 17209072846800.

The previous prime is 20211099999967. The next prime is 20211100000031. The reversal of 20211100000021 is 12000000111202.

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 20211100000021 - 2⁹ = 20211099999509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211099999953 and 20211100000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211100000031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9560594970 + ... + 9560597083.

It is an arithmetic number, because the mean of its divisors is an integer number (2906421192208).

Almost surely, 2^{20211100000021} is an apocalyptic number.

It is an amenable number.

20211100000021 is a deficient number, since it is larger than the sum of its proper divisors (3040269537643).

20211100000021 is a wasteful number, since it uses less digits than its factorization.

20211100000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19121192211.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20211100000021 its reverse (12000000111202), we get a palindrome (32211100111223).

The spelling of 20211100000021 in words is "twenty trillion, two hundred eleven billion, one hundred million, twenty-one", and thus it is an aban number.