1321306788231 has 64 divisors (see below), whose sum is σ = 2005903872000. Its totient is φ = 859326213600.

The previous prime is 1321306788209. The next prime is 1321306788239. The reversal of 1321306788231 is 1328876031231.

1321306788231 is a `hidden beast` number, since 1 + 32 + 1 + 306 + 7 + 88 + 231 = 666.

It is not a de Polignac number, because 1321306788231 - 2⁷ = 1321306788103 is a prime.

It is a super-2 number, since 2×1321306788231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321306788239) 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, 302841456 + ... + 302845818.

It is an arithmetic number, because the mean of its divisors is an integer number (31342248000).

Almost surely, 2^{1321306788231} is an apocalyptic number.

1321306788231 is a deficient number, since it is larger than the sum of its proper divisors (684597083769).

1321306788231 is a wasteful number, since it uses less digits than its factorization.

1321306788231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5841 (or 5835 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 1321306788231 in words is "one trillion, three hundred twenty-one billion, three hundred six million, seven hundred eighty-eight thousand, two hundred thirty-one".