2021212202220 has 144 divisors (see below), whose sum is σ = 6374318146560. Its totient is φ = 517850409600.

The previous prime is 2021212202161. The next prime is 2021212202221. The reversal of 2021212202220 is 222022121202.

2021212202220 is a `hidden beast` number, since 20 + 212 + 12 + 202 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2021212202193 and 2021212202202.

It is not an unprimeable number, because it can be changed into a prime (2021212202221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 527346 + ... + 2078585.

It is an arithmetic number, because the mean of its divisors is an integer number (44266098240).

Almost surely, 2^{2021212202220} is an apocalyptic number.

2021212202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021212202220 is an abundant number, since it is smaller than the sum of its proper divisors (4353105944340).

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

2021212202220 is a wasteful number, since it uses less digits than its factorization.

2021212202220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606116 (or 2606111 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 2021212202220 its reverse (222022121202), we get a palindrome (2243234323422).

The spelling of 2021212202220 in words is "two trillion, twenty-one billion, two hundred twelve million, two hundred two thousand, two hundred twenty".