2021240424 has 128 divisors (see below), whose sum is σ = 6000353280. Its totient is φ = 555206400.

The previous prime is 2021240423. The next prime is 2021240453. The reversal of 2021240424 is 4240421202.

It is a super-2 number, since 2×2021240424² = 8170825703223399552, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 2021240424.

It is not an unprimeable number, because it can be changed into a prime (2021240423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 847714 + ... + 850094.

It is an arithmetic number, because the mean of its divisors is an integer number (46877760).

Almost surely, 2^2021240424 is an apocalyptic number.

2021240424 is a gapful number since it is divisible by the number (24) 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 2021240424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3000176640).

2021240424 is an abundant number, since it is smaller than the sum of its proper divisors (3979112856).

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

2021240424 is a wasteful number, since it uses less digits than its factorization.

2021240424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591 (or 2587 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 2021240424 is about 44958.2075265463. The cubic root of 2021240424 is about 1264.3655624941.

Adding to 2021240424 its reverse (4240421202), we get a palindrome (6261661626).

The spelling of 2021240424 in words is "two billion, twenty-one million, two hundred forty thousand, four hundred twenty-four".