1321220532400 has 60 divisors (see below), whose sum is σ = 3175132660200. Its totient is φ = 528338314240.

The previous prime is 1321220532397. The next prime is 1321220532449. The reversal of 1321220532400 is 42350221231.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 948936 + ... + 1882264.

It is an arithmetic number, because the mean of its divisors is an integer number (52918877670).

Almost surely, 2^{1321220532400} is an apocalyptic number.

1321220532400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321220532400 is an abundant number, since it is smaller than the sum of its proper divisors (1853912127800).

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

1321220532400 is a wasteful number, since it uses less digits than its factorization.

1321220532400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936886 (or 936875 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 1321220532400 its reverse (42350221231), we get a palindrome (1363570753631).

The spelling of 1321220532400 in words is "one trillion, three hundred twenty-one billion, two hundred twenty million, five hundred thirty-two thousand, four hundred".