1321525511320 has 256 divisors, whose sum is σ = 3641780736000. Its totient is φ = 421497644544.

The previous prime is 1321525511279. The next prime is 1321525511323. The reversal of 1321525511320 is 231155251231.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321525511323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 372573787 + ... + 372577333.

It is an arithmetic number, because the mean of its divisors is an integer number (14225706000).

Almost surely, 2^{1321525511320} is an apocalyptic number.

1321525511320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321525511320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1820890368000).

1321525511320 is an abundant number, since it is smaller than the sum of its proper divisors (2320255224680).

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

1321525511320 is a wasteful number, since it uses less digits than its factorization.

1321525511320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4830 (or 4826 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 1321525511320 in words is "one trillion, three hundred twenty-one billion, five hundred twenty-five million, five hundred eleven thousand, three hundred twenty".