1021320240 has 40 divisors (see below), whose sum is σ = 3166093488. Its totient is φ = 272352000.

The previous prime is 1021320239. The next prime is 1021320241. The reversal of 1021320240 is 420231201.

It is an interprime number because it is at equal distance from previous prime (1021320239) and next prime (1021320241).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1021320241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2127511 + ... + 2127990.

Almost surely, 2^1021320240 is an apocalyptic number.

1021320240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021320240 is an abundant number, since it is smaller than the sum of its proper divisors (2144773248).

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

1021320240 is a wasteful number, since it uses less digits than its factorization.

1021320240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4255517 (or 4255511 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1021320240 is about 31958.1013203225. The cubic root of 1021320240 is about 1007.0568306669.

Adding to 1021320240 its reverse (420231201), we get a palindrome (1441551441).

The spelling of 1021320240 in words is "one billion, twenty-one million, three hundred twenty thousand, two hundred forty".