31221213341 has 4 divisors (see below), whose sum is σ = 31810292892. Its totient is φ = 30632133792.

The previous prime is 31221213319. The next prime is 31221213367. The reversal of 31221213341 is 14331212213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26521425316 + 4699788025 = 162854^2 + 68555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31221213341 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 (31221213301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294539696 + ... + 294539801.

It is an arithmetic number, because the mean of its divisors is an integer number (7952573223).

Almost surely, 2^31221213341 is an apocalyptic number.

It is an amenable number.

31221213341 is a deficient number, since it is larger than the sum of its proper divisors (589079551).

31221213341 is an equidigital number, since it uses as much as digits as its factorization.

31221213341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589079550.

The product of its digits is 864, while the sum is 23.

Adding to 31221213341 its reverse (14331212213), we get a palindrome (45552425554).

The spelling of 31221213341 in words is "thirty-one billion, two hundred twenty-one million, two hundred thirteen thousand, three hundred forty-one".