1321002320 has 40 divisors (see below), whose sum is σ = 3350544480. Its totient is φ = 480364160.

The previous prime is 1321002307. The next prime is 1321002337. The reversal of 1321002320 is 232001231.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1321002295 and 1321002304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 749690 + ... + 751449.

It is an arithmetic number, because the mean of its divisors is an integer number (83763612).

Almost surely, 2^1321002320 is an apocalyptic number.

1321002320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321002320 is an abundant number, since it is smaller than the sum of its proper divisors (2029542160).

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

1321002320 is a wasteful number, since it uses less digits than its factorization.

1321002320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501163 (or 1501157 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1321002320 is about 36345.5956066206. The cubic root of 1321002320 is about 1097.2388933352.

Adding to 1321002320 its reverse (232001231), we get a palindrome (1553003551).

The spelling of 1321002320 in words is "one billion, three hundred twenty-one million, two thousand, three hundred twenty".