1021531140 has 144 divisors (see below), whose sum is σ = 3574876032. Its totient is φ = 231280128.

The previous prime is 1021531129. The next prime is 1021531163. The reversal of 1021531140 is 411351201.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 131032 + ... + 138608.

It is an arithmetic number, because the mean of its divisors is an integer number (24825528).

Almost surely, 2^1021531140 is an apocalyptic number.

1021531140 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 1021531140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1787438016).

1021531140 is an abundant number, since it is smaller than the sum of its proper divisors (2553344892).

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

1021531140 is a wasteful number, since it uses less digits than its factorization.

1021531140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7706 (or 7701 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1021531140 is about 31961.4007828193. The cubic root of 1021531140 is about 1007.1261441103.

Adding to 1021531140 its reverse (411351201), we get a palindrome (1432882341).

The spelling of 1021531140 in words is "one billion, twenty-one million, five hundred thirty-one thousand, one hundred forty".