2021777240 has 192 divisors, whose sum is σ = 5489920800. Its totient is φ = 667699200.

The previous prime is 2021777227. The next prime is 2021777269. The reversal of 2021777240 is 427771202.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2021777197 and 2021777206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11169950 + ... + 11170130.

Almost surely, 2^2021777240 is an apocalyptic number.

2021777240 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 2021777240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2744960400).

2021777240 is an abundant number, since it is smaller than the sum of its proper divisors (3468143560).

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

2021777240 is a wasteful number, since it uses less digits than its factorization.

2021777240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 32.

The square root of 2021777240 is about 44964.1772970439. The cubic root of 2021777240 is about 1264.4774857760.

The spelling of 2021777240 in words is "two billion, twenty-one million, seven hundred seventy-seven thousand, two hundred forty".