2021122220 has 48 divisors (see below), whose sum is σ = 4585915488. Its totient is φ = 743800320.

The previous prime is 2021122219. The next prime is 2021122241. The reversal of 2021122220 is 222211202.

It is a junction number, because it is equal to n+sod(n) for n = 2021122195 and 2021122204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67160 + ... + 92480.

It is an arithmetic number, because the mean of its divisors is an integer number (95539906).

Almost surely, 2^2021122220 is an apocalyptic number.

2021122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2292957744).

2021122220 is an abundant number, since it is smaller than the sum of its proper divisors (2564793268).

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

2021122220 is a wasteful number, since it uses less digits than its factorization.

2021122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25650 (or 25648 counting only the distinct ones).

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

The square root of 2021122220 is about 44956.8929086520. The cubic root of 2021122220 is about 1264.3409149264.

Adding to 2021122220 its reverse (222211202), we get a palindrome (2243333422).

The spelling of 2021122220 in words is "two billion, twenty-one million, one hundred twenty-two thousand, two hundred twenty".