2021643260 has 192 divisors, whose sum is σ = 5412234240. Its totient is φ = 617379840.

The previous prime is 2021643257. The next prime is 2021643287. The reversal of 2021643260 is 623461202.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7194320 + ... + 7194600.

It is an arithmetic number, because the mean of its divisors is an integer number (28188720).

Almost surely, 2^2021643260 is an apocalyptic number.

2021643260 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 2021643260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2706117120).

2021643260 is an abundant number, since it is smaller than the sum of its proper divisors (3390590980).

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

2021643260 is a wasteful number, since it uses less digits than its factorization.

2021643260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 2021643260 is about 44962.6874196817. The cubic root of 2021643260 is about 1264.4495535138.

The spelling of 2021643260 in words is "two billion, twenty-one million, six hundred forty-three thousand, two hundred sixty".