3121321131966 has 16 divisors (see below), whose sum is σ = 6246455748624. Its totient is φ = 1039804796544.

The previous prime is 3121321131961. The next prime is 3121321131967. The reversal of 3121321131966 is 6691311231213.

It is a happy number.

It is a super-3 number, since 3×3121321131966³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121321131961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158884555 + ... + 158904198.

It is an arithmetic number, because the mean of its divisors is an integer number (390403484289).

Almost surely, 2^{3121321131966} is an apocalyptic number.

3121321131966 is an abundant number, since it is smaller than the sum of its proper divisors (3125134616658).

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

3121321131966 is a wasteful number, since it uses less digits than its factorization.

3121321131966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317790395.

The product of its digits is 34992, while the sum is 39.

The spelling of 3121321131966 in words is "three trillion, one hundred twenty-one billion, three hundred twenty-one million, one hundred thirty-one thousand, nine hundred sixty-six".