31233201121 has 2 divisors, whose sum is σ = 31233201122. Its totient is φ = 31233201120.

The previous prime is 31233201107. The next prime is 31233201143. The reversal of 31233201121 is 12110233213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21768051600 + 9465149521 = 147540^2 + 97289^2 .

It is a cyclic number.

It is not a de Polignac number, because 31233201121 - 2¹⁵ = 31233168353 is a prime.

It is not a weakly prime, because it can be changed into another prime (31233201191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15616600560 + 15616600561.

It is an arithmetic number, because the mean of its divisors is an integer number (15616600561).

Almost surely, 2^31233201121 is an apocalyptic number.

It is an amenable number.

31233201121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31233201121 is an equidigital number, since it uses as much as digits as its factorization.

31233201121 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 31233201121 its reverse (12110233213), we get a palindrome (43343434334).

The spelling of 31233201121 in words is "thirty-one billion, two hundred thirty-three million, two hundred one thousand, one hundred twenty-one".