1321004963520 has 224 divisors, whose sum is σ = 5083867952640. Its totient is φ = 320243604480.

The previous prime is 1321004963519. The next prime is 1321004963527. The reversal of 1321004963520 is 253694001231.

1321004963520 is a `hidden beast` number, since 1 + 3 + 2 + 10 + 0 + 4 + 9 + 635 + 2 + 0 = 666.

It is a super-2 number, since 2×1321004963520² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1321004963527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6854692 + ... + 7044771.

Almost surely, 2^{1321004963520} is an apocalyptic number.

1321004963520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321004963520 is an abundant number, since it is smaller than the sum of its proper divisors (3762862989120).

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

1321004963520 is a wasteful number, since it uses less digits than its factorization.

1321004963520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13899500 (or 13899484 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

Adding to 1321004963520 its reverse (253694001231), we get a palindrome (1574698964751).

The spelling of 1321004963520 in words is "one trillion, three hundred twenty-one billion, four million, nine hundred sixty-three thousand, five hundred twenty".