2021656320 has 720 divisors, whose sum is σ = 8120141568. Its totient is φ = 477757440.

The previous prime is 2021656267. The next prime is 2021656339. The reversal of 2021656320 is 236561202.

2021656320 is a `hidden beast` number, since 2 + 0 + 2 + 1 + 656 + 3 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 54639342 + ... + 54639378.

Almost surely, 2^2021656320 is an apocalyptic number.

2021656320 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 2021656320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4060070784).

2021656320 is an abundant number, since it is smaller than the sum of its proper divisors (6098485248).

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

2021656320 is a wasteful number, since it uses less digits than its factorization.

2021656320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 2021656320 is about 44962.8326509796. The cubic root of 2021656320 is about 1264.4522763277.

The spelling of 2021656320 in words is "two billion, twenty-one million, six hundred fifty-six thousand, three hundred twenty".