2020220021 has 4 divisors (see below), whose sum is σ = 2053338444. Its totient is φ = 1987101600.

The previous prime is 2020219969. The next prime is 2020220071. The reversal of 2020220021 is 1200220202.

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 127012900 + 1893207121 = 11270^2 + 43511^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020220021 - 2¹⁰ = 2020218997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2020219984 and 2020220011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020220071) 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, 16559120 + ... + 16559241.

It is an arithmetic number, because the mean of its divisors is an integer number (513334611).

Almost surely, 2^2020220021 is an apocalyptic number.

It is an amenable number.

2020220021 is a deficient number, since it is larger than the sum of its proper divisors (33118423).

2020220021 is an equidigital number, since it uses as much as digits as its factorization.

2020220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33118422.

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

The square root of 2020220021 is about 44946.8577433395. The cubic root of 2020220021 is about 1264.1527592459.

Adding to 2020220021 its reverse (1200220202), we get a palindrome (3220440223).

The spelling of 2020220021 in words is "two billion, twenty million, two hundred twenty thousand, twenty-one".