2021199980 has 48 divisors (see below), whose sum is σ = 4453989120. Its totient is φ = 768977088.

The previous prime is 2021199967. The next prime is 2021200007. The reversal of 2021199980 is 899911202.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70067 + ... + 94613.

It is an arithmetic number, because the mean of its divisors is an integer number (92791440).

Almost surely, 2^2021199980 is an apocalyptic number.

2021199980 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 2021199980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2226994560).

2021199980 is an abundant number, since it is smaller than the sum of its proper divisors (2432789140).

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

2021199980 is a wasteful number, since it uses less digits than its factorization.

2021199980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24758 (or 24756 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 2021199980 is about 44957.7577287836. The cubic root of 2021199980 is about 1264.3571293324.

The spelling of 2021199980 in words is "two billion, twenty-one million, one hundred ninety-nine thousand, nine hundred eighty".