121321123123 has 4 divisors (see below), whose sum is σ = 123029871408. Its totient is φ = 119612374840.

The previous prime is 121321123117. The next prime is 121321123129. The reversal of 121321123123 is 321321123121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321321123121 = 19 ⋅16911638059.

It is an interprime number because it is at equal distance from previous prime (121321123117) and next prime (121321123129).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121321123123 is a prime.

It is a super-2 number, since 2×121321123123² (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 = 121321123094 and 121321123103.

It is not an unprimeable number, because it can be changed into a prime (121321123129) 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, 854374036 + ... + 854374177.

It is an arithmetic number, because the mean of its divisors is an integer number (30757467852).

Almost surely, 2^121321123123 is an apocalyptic number.

121321123123 is a deficient number, since it is larger than the sum of its proper divisors (1708748285).

121321123123 is an equidigital number, since it uses as much as digits as its factorization.

121321123123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708748284.

The product of its digits is 432, while the sum is 22.

Adding to 121321123123 its reverse (321321123121), we get a palindrome (442642246244).

The spelling of 121321123123 in words is "one hundred twenty-one billion, three hundred twenty-one million, one hundred twenty-three thousand, one hundred twenty-three".