2021220020 has 12 divisors (see below), whose sum is σ = 4244562084. Its totient is φ = 808488000.

The previous prime is 2021220017. The next prime is 2021220023. The reversal of 2021220020 is 200221202.

It is an interprime number because it is at equal distance from previous prime (2021220017) and next prime (2021220023).

It can be written as a sum of positive squares in 2 ways, for example, as 709476496 + 1311743524 = 26636^2 + 36218^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2021219983 and 2021220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021220023) 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, 50530481 + ... + 50530520.

It is an arithmetic number, because the mean of its divisors is an integer number (353713507).

Almost surely, 2^2021220020 is an apocalyptic number.

2021220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021220020 is an abundant number, since it is smaller than the sum of its proper divisors (2223342064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021220020 is a wasteful number, since it uses less digits than its factorization.

2021220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101061010 (or 101061008 counting only the distinct ones).

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

The square root of 2021220020 is about 44957.9806041152. The cubic root of 2021220020 is about 1264.3613079777.

Adding to 2021220020 its reverse (200221202), we get a palindrome (2221441222).

The spelling of 2021220020 in words is "two billion, twenty-one million, two hundred twenty thousand, twenty".