2021015880 has 128 divisors (see below), whose sum is σ = 7254979200. Its totient is φ = 497477376.

The previous prime is 2021015869. The next prime is 2021015881. The reversal of 2021015880 is 885101202.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2021015881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57934 + ... + 86013.

It is an arithmetic number, because the mean of its divisors is an integer number (56679525).

Almost surely, 2^2021015880 is an apocalyptic number.

2021015880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021015880 is an abundant number, since it is smaller than the sum of its proper divisors (5233963320).

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

2021015880 is a wasteful number, since it uses less digits than its factorization.

2021015880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143980 (or 143970 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 2021015880 is about 44955.7102046003. The cubic root of 2021015880 is about 1264.3187403857.

The spelling of 2021015880 in words is "two billion, twenty-one million, fifteen thousand, eight hundred eighty".