121311031231 has 4 divisors (see below), whose sum is σ = 130642649032. Its totient is φ = 111979413432.

The previous prime is 121311031211. The next prime is 121311031243. The reversal of 121311031231 is 132130113121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132130113121 = 23 ⋅5744787527.

It is a cyclic number.

It is not a de Polignac number, because 121311031231 - 2¹⁷ = 121310900159 is a prime.

It is a super-2 number, since 2×121311031231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121311031199 and 121311031208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121311031211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4665808881 + ... + 4665808906.

It is an arithmetic number, because the mean of its divisors is an integer number (32660662258).

Almost surely, 2^121311031231 is an apocalyptic number.

121311031231 is a deficient number, since it is larger than the sum of its proper divisors (9331617801).

121311031231 is an equidigital number, since it uses as much as digits as its factorization.

121311031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9331617800.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 121311031231 its reverse (132130113121), we get a palindrome (253441144352).

The spelling of 121311031231 in words is "one hundred twenty-one billion, three hundred eleven million, thirty-one thousand, two hundred thirty-one".