31331321121 has 8 divisors (see below), whose sum is σ = 41776173504. Its totient is φ = 20887008080.

The previous prime is 31331321111. The next prime is 31331321129. The reversal of 31331321121 is 12112313313.

It is a happy number.

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 31331321121 - 2⁵ = 31331321089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31331321129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29236 + ... + 252026.

It is an arithmetic number, because the mean of its divisors is an integer number (5222021688).

Almost surely, 2^31331321121 is an apocalyptic number.

It is an amenable number.

31331321121 is a deficient number, since it is larger than the sum of its proper divisors (10444852383).

31331321121 is a wasteful number, since it uses less digits than its factorization.

31331321121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269671.

The product of its digits is 324, while the sum is 21.

Adding to 31331321121 its reverse (12112313313), we get a palindrome (43443634434).

The spelling of 31331321121 in words is "thirty-one billion, three hundred thirty-one million, three hundred twenty-one thousand, one hundred twenty-one".