20202021000221 has 4 divisors (see below), whose sum is σ = 20206112968092. Its totient is φ = 20197929032352.

The previous prime is 20202021000157. The next prime is 20202021000257. The reversal of 20202021000221 is 12200012020202.

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 5311019839225 + 14891001160996 = 2304565^2 + 3858886^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202021000221 - 2⁶ = 20202021000157 is a prime.

It is a super-3 number, since 3×20202021000221³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20202021000196 and 20202021000205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202021003221) 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, 2045976530 + ... + 2045986403.

It is an arithmetic number, because the mean of its divisors is an integer number (5051528242023).

Almost surely, 2^{20202021000221} is an apocalyptic number.

It is an amenable number.

20202021000221 is a deficient number, since it is larger than the sum of its proper divisors (4091967871).

20202021000221 is an equidigital number, since it uses as much as digits as its factorization.

20202021000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4091967870.

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

Adding to 20202021000221 its reverse (12200012020202), we get a palindrome (32402033020423).

The spelling of 20202021000221 in words is "twenty trillion, two hundred two billion, twenty-one million, two hundred twenty-one", and thus it is an aban number.