1321521465 has 48 divisors (see below), whose sum is σ = 2425256064. Its totient is φ = 612860160.

The previous prime is 1321521463. The next prime is 1321521493. The reversal of 1321521465 is 5641251231.

It is not a de Polignac number, because 1321521465 - 2¹ = 1321521463 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1321521463) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25917 + ... + 57573.

It is an arithmetic number, because the mean of its divisors is an integer number (50526168).

Almost surely, 2^1321521465 is an apocalyptic number.

1321521465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321521465 is a deficient number, since it is larger than the sum of its proper divisors (1103734599).

1321521465 is a wasteful number, since it uses less digits than its factorization.

1321521465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31710 (or 31699 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 1321521465 is about 36352.7366920291. The cubic root of 1321521465 is about 1097.3826103379.

Adding to 1321521465 its reverse (5641251231), we get a palindrome (6962772696).

The spelling of 1321521465 in words is "one billion, three hundred twenty-one million, five hundred twenty-one thousand, four hundred sixty-five".