2021615020 has 12 divisors (see below), whose sum is σ = 4245391584. Its totient is φ = 808646000.

The previous prime is 2021615009. The next prime is 2021615023. The reversal of 2021615020 is 205161202.

It is not an unprimeable number, because it can be changed into a prime (2021615023) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 50540356 + ... + 50540395.

It is an arithmetic number, because the mean of its divisors is an integer number (353782632).

Almost surely, 2^2021615020 is an apocalyptic number.

2021615020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021615020 is an abundant number, since it is smaller than the sum of its proper divisors (2223776564).

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

2021615020 is a wasteful number, since it uses less digits than its factorization.

2021615020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101080760 (or 101080758 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2021615020 is about 44962.3733804167. The cubic root of 2021615020 is about 1264.4436658575.

Adding to 2021615020 its reverse (205161202), we get a palindrome (2226776222).

The spelling of 2021615020 in words is "two billion, twenty-one million, six hundred fifteen thousand, twenty".