2021931840 has 112 divisors (see below), whose sum is σ = 6698821248. Its totient is φ = 515733504.

The previous prime is 2021931833. The next prime is 2021931841. The reversal of 2021931840 is 481391202.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2021931798 and 2021931807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021931841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23707 + ... + 67866.

It is an arithmetic number, because the mean of its divisors is an integer number (59810904).

Almost surely, 2^2021931840 is an apocalyptic number.

2021931840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021931840 is an abundant number, since it is smaller than the sum of its proper divisors (4676889408).

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

2021931840 is a wasteful number, since it uses less digits than its factorization.

2021931840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91616 (or 91606 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 2021931840 is about 44965.8964105020. The cubic root of 2021931840 is about 1264.5097153795.

The spelling of 2021931840 in words is "two billion, twenty-one million, nine hundred thirty-one thousand, eight hundred forty".