1321370865 has 96 divisors (see below), whose sum is σ = 2495201280. Its totient is φ = 644692608.

The previous prime is 1321370821. The next prime is 1321370879. The reversal of 1321370865 is 5680731231.

It is not a de Polignac number, because 1321370865 - 2¹⁵ = 1321338097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4669014 + ... + 4669296.

It is an arithmetic number, because the mean of its divisors is an integer number (25991680).

Almost surely, 2^1321370865 is an apocalyptic number.

1321370865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321370865 is a deficient number, since it is larger than the sum of its proper divisors (1173830415).

1321370865 is a wasteful number, since it uses less digits than its factorization.

1321370865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 1321370865 is about 36350.6652621379. The cubic root of 1321370865 is about 1097.3409230091.

The spelling of 1321370865 in words is "one billion, three hundred twenty-one million, three hundred seventy thousand, eight hundred sixty-five".