121311112321 has 16 divisors (see below), whose sum is σ = 139331275776. Its totient is φ = 103464614736.

The previous prime is 121311112271. The next prime is 121311112331. The reversal of 121311112321 is 123211113121.

It is not a de Polignac number, because 121311112321 - 2²³ = 121302723713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121311112331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1213380 + ... + 1309546.

It is an arithmetic number, because the mean of its divisors is an integer number (8708204736).

Almost surely, 2^121311112321 is an apocalyptic number.

It is an amenable number.

121311112321 is a deficient number, since it is larger than the sum of its proper divisors (18020163455).

121311112321 is an equidigital number, since it uses as much as digits as its factorization.

121311112321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97068.

The product of its digits is 72, while the sum is 19.

Adding to 121311112321 its reverse (123211113121), we get a palindrome (244522225442).

The spelling of 121311112321 in words is "one hundred twenty-one billion, three hundred eleven million, one hundred twelve thousand, three hundred twenty-one".