2021210221220 has 24 divisors (see below), whose sum is σ = 4390904964600. Its totient is φ = 780605326592.

The previous prime is 2021210221207. The next prime is 2021210221253. The reversal of 2021210221220 is 221220121202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 155647608484 + 1865562612736 = 394522^2 + 1365856^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1742422025 + ... + 1742423184.

It is an arithmetic number, because the mean of its divisors is an integer number (182954373525).

Almost surely, 2^{2021210221220} is an apocalyptic number.

2021210221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021210221220 is an abundant number, since it is smaller than the sum of its proper divisors (2369694743380).

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

2021210221220 is a wasteful number, since it uses less digits than its factorization.

2021210221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3484845247 (or 3484845245 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2021210221220 its reverse (221220121202), we get a palindrome (2242430342422).

The spelling of 2021210221220 in words is "two trillion, twenty-one billion, two hundred ten million, two hundred twenty-one thousand, two hundred twenty".