20221001020021 has 2 divisors, whose sum is σ = 20221001020022. Its totient is φ = 20221001020020.

The previous prime is 20221001019929. The next prime is 20221001020109. The reversal of 20221001020021 is 12002010012202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13943420659921 + 6277580360100 = 3734089^2 + 2505510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20221001020021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20221001019983 and 20221001020010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221001020421) 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 as a sum of consecutive naturals, namely, 10110500510010 + 10110500510011.

It is an arithmetic number, because the mean of its divisors is an integer number (10110500510011).

Almost surely, 2^{20221001020021} is an apocalyptic number.

It is an amenable number.

20221001020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221001020021 is an equidigital number, since it uses as much as digits as its factorization.

20221001020021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20221001020021 its reverse (12002010012202), we get a palindrome (32223011032223).

The spelling of 20221001020021 in words is "twenty trillion, two hundred twenty-one billion, one million, twenty thousand, twenty-one".