2021841620 has 24 divisors (see below), whose sum is σ = 4495625064. Its totient is φ = 761163776.

The previous prime is 2021841589. The next prime is 2021841631. The reversal of 2021841620 is 261481202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 580424464 + 1441417156 = 24092^2 + 37966^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2021841620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2972957 + ... + 2973636.

It is an arithmetic number, because the mean of its divisors is an integer number (187317711).

Almost surely, 2^2021841620 is an apocalyptic number.

2021841620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021841620 is an abundant number, since it is smaller than the sum of its proper divisors (2473783444).

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

2021841620 is a wasteful number, since it uses less digits than its factorization.

2021841620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5946619 (or 5946617 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 2021841620 is about 44964.8931945801. The cubic root of 2021841620 is about 1264.4909073331.

The spelling of 2021841620 in words is "two billion, twenty-one million, eight hundred forty-one thousand, six hundred twenty".