1021808424 has 128 divisors (see below), whose sum is σ = 3191408640. Its totient is φ = 265427712.

The previous prime is 1021808413. The next prime is 1021808461. The reversal of 1021808424 is 4248081201.

It is a junction number, because it is equal to n+sod(n) for n = 1021808391 and 1021808400.

It is an unprimeable number.

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, 142837 + ... + 149819.

It is an arithmetic number, because the mean of its divisors is an integer number (24932880).

Almost surely, 2^1021808424 is an apocalyptic number.

1021808424 is a gapful number since it is divisible by the number (14) 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 1021808424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1595704320).

1021808424 is an abundant number, since it is smaller than the sum of its proper divisors (2169600216).

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

1021808424 is a wasteful number, since it uses less digits than its factorization.

1021808424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7079 (or 7075 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 30.

The square root of 1021808424 is about 31965.7382833558. The cubic root of 1021808424 is about 1007.2172605045.

Adding to 1021808424 its reverse (4248081201), we get a palindrome (5269889625).

The spelling of 1021808424 in words is "one billion, twenty-one million, eight hundred eight thousand, four hundred twenty-four".