20222100020021 has 4 divisors (see below), whose sum is σ = 20222355580332. Its totient is φ = 20221844459712.

The previous prime is 20222100020009. The next prime is 20222100020047. The reversal of 20222100020021 is 12002000122202.

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 18687377952100 + 1534722067921 = 4322890^2 + 1238839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20222100020021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20222100019978 and 20222100020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20222100020071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127661426 + ... + 127819731.

It is an arithmetic number, because the mean of its divisors is an integer number (5055588895083).

Almost surely, 2^{20222100020021} is an apocalyptic number.

It is an amenable number.

20222100020021 is a deficient number, since it is larger than the sum of its proper divisors (255560311).

20222100020021 is an equidigital number, since it uses as much as digits as its factorization.

20222100020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255560310.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20222100020021 its reverse (12002000122202), we get a palindrome (32224100142223).

The spelling of 20222100020021 in words is "twenty trillion, two hundred twenty-two billion, one hundred million, twenty thousand, twenty-one".