1321324004040 has 64 divisors (see below), whose sum is σ = 4019802629760. Its totient is φ = 347390346240.

The previous prime is 1321324004023. The next prime is 1321324004047. The reversal of 1321324004040 is 404004231231.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1321324004040.

It is not an unprimeable number, because it can be changed into a prime (1321324004047) 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, 77533969 + ... + 77551008.

It is an arithmetic number, because the mean of its divisors is an integer number (62809416090).

Almost surely, 2^{1321324004040} is an apocalyptic number.

1321324004040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321324004040 is an abundant number, since it is smaller than the sum of its proper divisors (2698478625720).

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

1321324004040 is a wasteful number, since it uses less digits than its factorization.

1321324004040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155085062 (or 155085058 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 1321324004040 its reverse (404004231231), we get a palindrome (1725328235271).

The spelling of 1321324004040 in words is "one trillion, three hundred twenty-one billion, three hundred twenty-four million, four thousand, forty".