31233210121 has 2 divisors, whose sum is σ = 31233210122. Its totient is φ = 31233210120.

The previous prime is 31233210119. The next prime is 31233210143. The reversal of 31233210121 is 12101233213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23046579721 + 8186630400 = 151811^2 + 90480^2 .

It is an emirp because it is prime and its reverse (12101233213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31233210121 - 2¹ = 31233210119 is a prime.

Together with 31233210119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31233210161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15616605060 + 15616605061.

It is an arithmetic number, because the mean of its divisors is an integer number (15616605061).

Almost surely, 2^31233210121 is an apocalyptic number.

It is an amenable number.

31233210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31233210121 is an equidigital number, since it uses as much as digits as its factorization.

31233210121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31233210121 its reverse (12101233213), we get a palindrome (43334443334).

The spelling of 31233210121 in words is "thirty-one billion, two hundred thirty-three million, two hundred ten thousand, one hundred twenty-one".