121231131313 has 4 divisors (see below), whose sum is σ = 121231835380. Its totient is φ = 121230427248.

The previous prime is 121231131251. The next prime is 121231131409. The reversal of 121231131313 is 313131132121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 313131132121 = 184039 ⋅1701439.

It can be written as a sum of positive squares in 2 ways, for example, as 65179621809 + 56051509504 = 255303^2 + 236752^2 .

It is a cyclic number.

It is not a de Polignac number, because 121231131313 - 2²¹ = 121229034161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121231131713) 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 3 ways as a sum of consecutive naturals, for example, 98131 + ... + 502087.

It is an arithmetic number, because the mean of its divisors is an integer number (30307958845).

Almost surely, 2^121231131313 is an apocalyptic number.

It is an amenable number.

121231131313 is a deficient number, since it is larger than the sum of its proper divisors (704067).

121231131313 is an equidigital number, since it uses as much as digits as its factorization.

121231131313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704066.

The product of its digits is 324, while the sum is 22.

Adding to 121231131313 its reverse (313131132121), we get a palindrome (434362263434).

The spelling of 121231131313 in words is "one hundred twenty-one billion, two hundred thirty-one million, one hundred thirty-one thousand, three hundred thirteen".