1321479331200 has 2304 divisors, whose sum is σ = 5904465840000. Its totient is φ = 274975948800.

The previous prime is 1321479331199. The next prime is 1321479331247. The reversal of 1321479331200 is 21339741231.

1321479331200 is a `hidden beast` number, since 1 + 32 + 1 + 479 + 33 + 120 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 8868988726 + ... + 8868988874.

Almost surely, 2^{1321479331200} is an apocalyptic number.

1321479331200 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 1321479331200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2952232920000).

1321479331200 is an abundant number, since it is smaller than the sum of its proper divisors (4582986508800).

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

1321479331200 is a wasteful number, since it uses less digits than its factorization.

1321479331200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The spelling of 1321479331200 in words is "one trillion, three hundred twenty-one billion, four hundred seventy-nine million, three hundred thirty-one thousand, two hundred".