3121323413221 has 6 divisors (see below), whose sum is σ = 3379894583730. Its totient is φ = 2881221612048.

The previous prime is 3121323413177. The next prime is 3121323413267. The reversal of 3121323413221 is 1223143231213.

It can be written as a sum of positive squares in 3 ways, for example, as 125325912196 + 2995997501025 = 354014^2 + 1730895^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3121323413221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3121323413221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121323411221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9234684486 + ... + 9234684823.

It is an arithmetic number, because the mean of its divisors is an integer number (563315763955).

Almost surely, 2^{3121323413221} is an apocalyptic number.

It is an amenable number.

3121323413221 is a deficient number, since it is larger than the sum of its proper divisors (258571170509).

3121323413221 is a wasteful number, since it uses less digits than its factorization.

3121323413221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18469369335 (or 18469369322 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

Adding to 3121323413221 its reverse (1223143231213), we get a palindrome (4344466644434).

The spelling of 3121323413221 in words is "three trillion, one hundred twenty-one billion, three hundred twenty-three million, four hundred thirteen thousand, two hundred twenty-one".