20020220002021 has 4 divisors (see below), whose sum is σ = 20020382320492. Its totient is φ = 20020057683552.

The previous prime is 20020220002009. The next prime is 20020220002051. The reversal of 20020220002021 is 12020002202002.

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 13877822837025 + 6142397164996 = 3725295^2 + 2478386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020220002021 - 2⁷ = 20020220001893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020220001992 and 20020220002010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020220002051) 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, 80974086 + ... + 81220951.

It is an arithmetic number, because the mean of its divisors is an integer number (5005095580123).

Almost surely, 2^{20020220002021} is an apocalyptic number.

It is an amenable number.

20020220002021 is a deficient number, since it is larger than the sum of its proper divisors (162318471).

20020220002021 is a wasteful number, since it uses less digits than its factorization.

20020220002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162318470.

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 20020220002021 its reverse (12020002202002), we get a palindrome (32040222204023).

The spelling of 20020220002021 in words is "twenty trillion, twenty billion, two hundred twenty million, two thousand, twenty-one".