2021212220 has 12 divisors (see below), whose sum is σ = 4244545704. Its totient is φ = 808484880.

The previous prime is 2021212213. The next prime is 2021212241. The reversal of 2021212220 is 222121202.

It is a junction number, because it is equal to n+sod(n) for n = 2021212195 and 2021212204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50530286 + ... + 50530325.

It is an arithmetic number, because the mean of its divisors is an integer number (353712142).

Almost surely, 2^2021212220 is an apocalyptic number.

2021212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021212220 is an abundant number, since it is smaller than the sum of its proper divisors (2223333484).

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

2021212220 is a wasteful number, since it uses less digits than its factorization.

2021212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101060620 (or 101060618 counting only the distinct ones).

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

The square root of 2021212220 is about 44957.8938563630. The cubic root of 2021212220 is about 1264.3596815621.

Adding to 2021212220 its reverse (222121202), we get a palindrome (2243333422).

The spelling of 2021212220 in words is "two billion, twenty-one million, two hundred twelve thousand, two hundred twenty".