1330021520 has 80 divisors (see below), whose sum is σ = 3379926528. Its totient is φ = 484546560.

The previous prime is 1330021513. The next prime is 1330021523. The reversal of 1330021520 is 251200331.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1330021520² = 3537914487326220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (1330021523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26387 + ... + 57933.

Almost surely, 2^1330021520 is an apocalyptic number.

1330021520 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 1330021520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1689963264).

1330021520 is an abundant number, since it is smaller than the sum of its proper divisors (2049905008).

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

1330021520 is a wasteful number, since it uses less digits than its factorization.

1330021520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31608 (or 31602 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 1330021520 is about 36469.4601001989. The cubic root of 1330021520 is about 1099.7303802002.

Adding to 1330021520 its reverse (251200331), we get a palindrome (1581221851).

The spelling of 1330021520 in words is "one billion, three hundred thirty million, twenty-one thousand, five hundred twenty".