31313441343221 has 8 divisors (see below), whose sum is σ = 31772086212120. Its totient is φ = 30855599004672.

The previous prime is 31313441343193. The next prime is 31313441343253. The reversal of 31313441343221 is 12234314431313.

It can be written as a sum of positive squares in 4 ways, for example, as 280063224100 + 31033378119121 = 529210^2 + 5570761^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31313441343221 - 2¹⁸ = 31313441081077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313441343521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200553980 + ... + 200710053.

It is an arithmetic number, because the mean of its divisors is an integer number (3971510776515).

Almost surely, 2^{31313441343221} is an apocalyptic number.

It is an amenable number.

31313441343221 is a deficient number, since it is larger than the sum of its proper divisors (458644868899).

31313441343221 is a wasteful number, since it uses less digits than its factorization.

31313441343221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401265175.

The product of its digits is 62208, while the sum is 35.

Adding to 31313441343221 its reverse (12234314431313), we get a palindrome (43547755774534).

The spelling of 31313441343221 in words is "thirty-one trillion, three hundred thirteen billion, four hundred forty-one million, three hundred forty-three thousand, two hundred twenty-one".