20022100000021 has 16 divisors (see below), whose sum is σ = 23597987143680. Its totient is φ = 16633303389360.

The previous prime is 20022100000009. The next prime is 20022100000109. The reversal of 20022100000021 is 12000000122002.

It is not a de Polignac number, because 20022100000021 - 2¹⁹ = 20022099475733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20022099999953 and 20022100000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022100400021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341376741 + ... + 341435386.

It is an arithmetic number, because the mean of its divisors is an integer number (1474874196480).

Almost surely, 2^{20022100000021} is an apocalyptic number.

It is an amenable number.

20022100000021 is a deficient number, since it is larger than the sum of its proper divisors (3575887143659).

20022100000021 is an equidigital number, since it uses as much as digits as its factorization.

20022100000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682812264.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20022100000021 its reverse (12000000122002), we get a palindrome (32022100122023).

The spelling of 20022100000021 in words is "twenty trillion, twenty-two billion, one hundred million, twenty-one", and thus it is an aban number.