2021387872 has 96 divisors (see below), whose sum is σ = 4618252800. Its totient is φ = 853079040.

The previous prime is 2021387861. The next prime is 2021387933. The reversal of 2021387872 is 2787831202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6106747 + ... + 6107077.

It is an arithmetic number, because the mean of its divisors is an integer number (48106800).

Almost surely, 2^2021387872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021387872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2309126400).

2021387872 is an abundant number, since it is smaller than the sum of its proper divisors (2596864928).

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

2021387872 is a wasteful number, since it uses less digits than its factorization.

2021387872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 2021387872 is about 44959.8473307016. The cubic root of 2021387872 is about 1264.3963065920.

The spelling of 2021387872 in words is "two billion, twenty-one million, three hundred eighty-seven thousand, eight hundred seventy-two".