1331430321 has 16 divisors (see below), whose sum is σ = 1912458240. Its totient is φ = 819058560.

The previous prime is 1331430319. The next prime is 1331430337. The reversal of 1331430321 is 1230341331.

It is not a de Polignac number, because 1331430321 - 2¹ = 1331430319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1331430341) 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, 194800 + ... + 201518.

It is an arithmetic number, because the mean of its divisors is an integer number (119528640).

Almost surely, 2^1331430321 is an apocalyptic number.

It is an amenable number.

1331430321 is a deficient number, since it is larger than the sum of its proper divisors (581027919).

1331430321 is a wasteful number, since it uses less digits than its factorization.

1331430321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11816.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 1331430321 is about 36488.7697929103. The cubic root of 1331430321 is about 1100.1185329568.

Adding to 1331430321 its reverse (1230341331), we get a palindrome (2561771652).

The spelling of 1331430321 in words is "one billion, three hundred thirty-one million, four hundred thirty thousand, three hundred twenty-one".