31333221121 has 2 divisors, whose sum is σ = 31333221122. Its totient is φ = 31333221120.

The previous prime is 31333221109. The next prime is 31333221131. The reversal of 31333221121 is 12112233313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30962273521 + 370947600 = 175961^2 + 19260^2 .

It is a cyclic number.

It is not a de Polignac number, because 31333221121 - 2⁵ = 31333221089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31333221092 and 31333221101.

It is not a weakly prime, because it can be changed into another prime (31333221131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15666610560 + 15666610561.

It is an arithmetic number, because the mean of its divisors is an integer number (15666610561).

Almost surely, 2^31333221121 is an apocalyptic number.

It is an amenable number.

31333221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31333221121 is an equidigital number, since it uses as much as digits as its factorization.

31333221121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 22.

Adding to 31333221121 its reverse (12112233313), we get a palindrome (43445454434).

The spelling of 31333221121 in words is "thirty-one billion, three hundred thirty-three million, two hundred twenty-one thousand, one hundred twenty-one".