31122103331221 has 4 divisors (see below), whose sum is σ = 35568118092832. Its totient is φ = 26676088569612.

The previous prime is 31122103331191. The next prime is 31122103331233. The reversal of 31122103331221 is 12213330122113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31122103331221 - 2¹⁵ = 31122103298453 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 (31122103331321) 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, 2223007380795 + ... + 2223007380808.

It is an arithmetic number, because the mean of its divisors is an integer number (8892029523208).

Almost surely, 2^{31122103331221} is an apocalyptic number.

It is an amenable number.

31122103331221 is a deficient number, since it is larger than the sum of its proper divisors (4446014761611).

31122103331221 is an equidigital number, since it uses as much as digits as its factorization.

31122103331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4446014761610.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31122103331221 its reverse (12213330122113), we get a palindrome (43335433453334).

The spelling of 31122103331221 in words is "thirty-one trillion, one hundred twenty-two billion, one hundred three million, three hundred thirty-one thousand, two hundred twenty-one".