20020002020021 has 4 divisors (see below), whose sum is σ = 20020056852972. Its totient is φ = 20019947187072.

The previous prime is 20020002019951. The next prime is 20020002020023. The reversal of 20020002020021 is 12002020002002.

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 17517154622500 + 2502847397521 = 4185350^2 + 1582039^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020002020021 - 2¹⁴ = 20020002003637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020002019984 and 20020002020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020002020023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26865116 + ... + 27600261.

It is an arithmetic number, because the mean of its divisors is an integer number (5005014213243).

Almost surely, 2^{20020002020021} is an apocalyptic number.

It is an amenable number.

20020002020021 is a deficient number, since it is larger than the sum of its proper divisors (54832951).

20020002020021 is an equidigital number, since it uses as much as digits as its factorization.

20020002020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54832950.

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 20020002020021 its reverse (12002020002002), we get a palindrome (32022022022023).

The spelling of 20020002020021 in words is "twenty trillion, twenty billion, two million, twenty thousand, twenty-one".