1321523520345 has 48 divisors (see below), whose sum is σ = 2617956012672. Its totient is φ = 604106380800.

The previous prime is 1321523520341. The next prime is 1321523520389. The reversal of 1321523520345 is 5430253251231.

1321523520345 is a `hidden beast` number, since 1 + 3 + 215 + 235 + 203 + 4 + 5 = 666.

It is not a de Polignac number, because 1321523520345 - 2² = 1321523520341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321523520341) 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, 20001334 + ... + 20067296.

It is an arithmetic number, because the mean of its divisors is an integer number (54540750264).

Almost surely, 2^{1321523520345} is an apocalyptic number.

1321523520345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321523520345 is a deficient number, since it is larger than the sum of its proper divisors (1296432492327).

1321523520345 is a wasteful number, since it uses less digits than its factorization.

1321523520345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129582 (or 129579 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 1321523520345 its reverse (5430253251231), we get a palindrome (6751776771576).

The spelling of 1321523520345 in words is "one trillion, three hundred twenty-one billion, five hundred twenty-three million, five hundred twenty thousand, three hundred forty-five".