231321121153 has 2 divisors, whose sum is σ = 231321121154. Its totient is φ = 231321121152.

The previous prime is 231321121139. The next prime is 231321121217. The reversal of 231321121153 is 351121123132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210816885904 + 20504235249 = 459148^2 + 143193^2 .

It is a cyclic number.

It is not a de Polignac number, because 231321121153 - 2⁵ = 231321121121 is a prime.

It is a super-2 number, since 2×231321121153² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231321151153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115660560576 + 115660560577.

It is an arithmetic number, because the mean of its divisors is an integer number (115660560577).

Almost surely, 2^231321121153 is an apocalyptic number.

It is an amenable number.

231321121153 is a deficient number, since it is larger than the sum of its proper divisors (1).

231321121153 is an equidigital number, since it uses as much as digits as its factorization.

231321121153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

Adding to 231321121153 its reverse (351121123132), we get a palindrome (582442244285).

The spelling of 231321121153 in words is "two hundred thirty-one billion, three hundred twenty-one million, one hundred twenty-one thousand, one hundred fifty-three".