1021538560 has 144 divisors (see below), whose sum is σ = 2918635776. Its totient is φ = 334946304.

The previous prime is 1021538549. The next prime is 1021538563. The reversal of 1021538560 is 658351201.

It is not an unprimeable number, because it can be changed into a prime (1021538563) 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, 203602 + ... + 208558.

It is an arithmetic number, because the mean of its divisors is an integer number (20268304).

Almost surely, 2^1021538560 is an apocalyptic number.

1021538560 is a gapful number since it is divisible by the number (10) 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 1021538560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1459317888).

1021538560 is an abundant number, since it is smaller than the sum of its proper divisors (1897097216).

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

1021538560 is an equidigital number, since it uses as much as digits as its factorization.

1021538560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5008 (or 4994 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1021538560 is about 31961.5168601241. The cubic root of 1021538560 is about 1007.1285825604.

Adding to 1021538560 its reverse (658351201), we get a palindrome (1679889761).

The spelling of 1021538560 in words is "one billion, twenty-one million, five hundred thirty-eight thousand, five hundred sixty".