2021445888 has 144 divisors (see below), whose sum is σ = 6707721216. Its totient is φ = 525035520.

The previous prime is 2021445887. The next prime is 2021445893. The reversal of 2021445888 is 8885441202.

It is a super-2 number, since 2×2021445888² = 8172486956224217088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (2021445883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42045 + ... + 76227.

Almost surely, 2^2021445888 is an apocalyptic number.

2021445888 is a gapful number since it is divisible by the number (28) 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 2021445888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3353860608).

2021445888 is an abundant number, since it is smaller than the sum of its proper divisors (4686275328).

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

2021445888 is a wasteful number, since it uses less digits than its factorization.

2021445888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34220 (or 34206 counting only the distinct ones).

The product of its (nonzero) digits is 163840, while the sum is 42.

The square root of 2021445888 is about 44960.4925239927. The cubic root of 2021445888 is about 1264.4084029863.

The spelling of 2021445888 in words is "two billion, twenty-one million, four hundred forty-five thousand, eight hundred eighty-eight".