1331021330 has 32 divisors (see below), whose sum is σ = 2477542464. Its totient is φ = 514552896.

The previous prime is 1331021303. The next prime is 1331021333. The reversal of 1331021330 is 331201331.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1331021299 and 1331021308.

It is not an unprimeable number, because it can be changed into a prime (1331021333) 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, 16769 + ... + 54251.

It is an arithmetic number, because the mean of its divisors is an integer number (77423202).

Almost surely, 2^1331021330 is an apocalyptic number.

1331021330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1331021330 is a deficient number, since it is larger than the sum of its proper divisors (1146521134).

1331021330 is a wasteful number, since it uses less digits than its factorization.

1331021330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37610.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 1331021330 is about 36483.1650216919. The cubic root of 1331021330 is about 1100.0058760017.

Adding to 1331021330 its reverse (331201331), we get a palindrome (1662222661).

The spelling of 1331021330 in words is "one billion, three hundred thirty-one million, twenty-one thousand, three hundred thirty".