1321031001000 has 128 divisors (see below), whose sum is σ = 4122109555200. Its totient is φ = 352232812800.

The previous prime is 1321031000981. The next prime is 1321031001001. The reversal of 1321031001000 is 1001301231.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (1321031001001) 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, 31265889 + ... + 31308111.

It is an arithmetic number, because the mean of its divisors is an integer number (32203980900).

Almost surely, 2^{1321031001000} is an apocalyptic number.

1321031001000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321031001000 is an abundant number, since it is smaller than the sum of its proper divisors (2801078554200).

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

1321031001000 is a wasteful number, since it uses less digits than its factorization.

1321031001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52676 (or 52662 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 1321031001000 its reverse (1001301231), we get a palindrome (1322032302231).

The spelling of 1321031001000 in words is "one trillion, three hundred twenty-one billion, thirty-one million, one thousand".