1021320340 has 24 divisors (see below), whose sum is σ = 2190408192. Its totient is φ = 399835680.

The previous prime is 1021320331. The next prime is 1021320353. The reversal of 1021320340 is 430231201.

It is a happy number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 542316 + ... + 544195.

It is an arithmetic number, because the mean of its divisors is an integer number (91267008).

Almost surely, 2^1021320340 is an apocalyptic number.

1021320340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021320340 is an abundant number, since it is smaller than the sum of its proper divisors (1169087852).

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

1021320340 is a wasteful number, since it uses less digits than its factorization.

1021320340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086567 (or 1086565 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1021320340 is about 31958.1028848710. The cubic root of 1021320340 is about 1007.0568635347.

Adding to 1021320340 its reverse (430231201), we get a palindrome (1451551541).

The spelling of 1021320340 in words is "one billion, twenty-one million, three hundred twenty thousand, three hundred forty".