2021259240 has 768 divisors, whose sum is σ = 9057484800. Its totient is φ = 377395200.

The previous prime is 2021259239. The next prime is 2021259257. The reversal of 2021259240 is 429521202.

It is a happy number.

2021259240 is a `hidden beast` number, since 20 + 2 + 12 + 592 + 40 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 25585521 + ... + 25585599.

It is an arithmetic number, because the mean of its divisors is an integer number (11793600).

Almost surely, 2^2021259240 is an apocalyptic number.

2021259240 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 2021259240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4528742400).

2021259240 is an abundant number, since it is smaller than the sum of its proper divisors (7036225560).

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

2021259240 is a wasteful number, since it uses less digits than its factorization.

2021259240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 2021259240 is about 44958.4167870711. The cubic root of 2021259240 is about 1264.3694858652.

The spelling of 2021259240 in words is "two billion, twenty-one million, two hundred fifty-nine thousand, two hundred forty".