123121012231 has 6 divisors (see below), whose sum is σ = 143222402040. Its totient is φ = 105532296156.

The previous prime is 123121012229. The next prime is 123121012243. The reversal of 123121012231 is 132210121321.

It is not a de Polignac number, because 123121012231 - 2¹ = 123121012229 is a prime.

It is a super-2 number, since 2×123121012231² (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 = 123121012199 and 123121012208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123121012291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1256336811 + ... + 1256336908.

It is an arithmetic number, because the mean of its divisors is an integer number (23870400340).

Almost surely, 2^123121012231 is an apocalyptic number.

123121012231 is a deficient number, since it is larger than the sum of its proper divisors (20101389809).

123121012231 is an equidigital number, since it uses as much as digits as its factorization.

123121012231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512673733 (or 2512673726 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 123121012231 its reverse (132210121321), we get a palindrome (255331133552).

The spelling of 123121012231 in words is "one hundred twenty-three billion, one hundred twenty-one million, twelve thousand, two hundred thirty-one".