1021320 has 48 divisors (see below), whose sum is σ = 3320460. Its totient is φ = 272256.

The previous prime is 1021303. The next prime is 1021327. The reversal of 1021320 is 231201.

It is a happy number.

1021320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 887364 + 133956 = 942^2 + 366^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1021327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1059 + ... + 1778.

2^1021320 is an apocalyptic number.

1021320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021320 is an abundant number, since it is smaller than the sum of its proper divisors (2299140).

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

1021320 is a wasteful number, since it uses less digits than its factorization.

1021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2854 (or 2847 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1021320 is about 1010.6037799256. The cubic root of 1021320 is about 100.7056751784.

Adding to 1021320 its reverse (231201), we get a palindrome (1252521).

The spelling of 1021320 in words is "one million, twenty-one thousand, three hundred twenty".