1331021000 has 64 divisors (see below), whose sum is σ = 3120024960. Its totient is φ = 531480000.

The previous prime is 1331020987. The next prime is 1331021057. The reversal of 1331021000 is 1201331.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1030355 + ... + 1031645.

It is an arithmetic number, because the mean of its divisors is an integer number (48750390).

Almost surely, 2^1331021000 is an apocalyptic number.

1331021000 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 1331021000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1560012480).

1331021000 is an abundant number, since it is smaller than the sum of its proper divisors (1789003960).

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

1331021000 is a wasteful number, since it uses less digits than its factorization.

1331021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2343 (or 2329 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 1331021000 is about 36483.1604990576. The cubic root of 1331021000 is about 1100.0057850935.

Adding to 1331021000 its reverse (1201331), we get a palindrome (1332222331).

The spelling of 1331021000 in words is "one billion, three hundred thirty-one million, twenty-one thousand".