2021985520 has 40 divisors (see below), whose sum is σ = 4815785520. Its totient is φ = 789066240.

The previous prime is 2021985439. The next prime is 2021985547. The reversal of 2021985520 is 255891202.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 304950 + ... + 311509.

It is an arithmetic number, because the mean of its divisors is an integer number (120394638).

Almost surely, 2^2021985520 is an apocalyptic number.

2021985520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021985520 is an abundant number, since it is smaller than the sum of its proper divisors (2793800000).

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

2021985520 is a wasteful number, since it uses less digits than its factorization.

2021985520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616513 (or 616507 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 2021985520 is about 44966.4933033475. The cubic root of 2021985520 is about 1264.5209057140.

The spelling of 2021985520 in words is "two billion, twenty-one million, nine hundred eighty-five thousand, five hundred twenty".