123121243115440 has 80 divisors (see below), whose sum is σ = 289779831966240. Its totient is φ = 48645996779520.

The previous prime is 123121243115407. The next prime is 123121243115509. The reversal of 123121243115440 is 44511342121321.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 123121243115396 and 123121243115405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25911021 + ... + 30292300.

It is an arithmetic number, because the mean of its divisors is an integer number (3622247899578).

Almost surely, 2^{123121243115440} is an apocalyptic number.

123121243115440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123121243115440 is an abundant number, since it is smaller than the sum of its proper divisors (166658588850800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123121243115440 is a wasteful number, since it uses less digits than its factorization.

123121243115440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56203670 (or 56203664 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

Adding to 123121243115440 its reverse (44511342121321), we get a palindrome (167632585236761).

The spelling of 123121243115440 in words is "one hundred twenty-three trillion, one hundred twenty-one billion, two hundred forty-three million, one hundred fifteen thousand, four hundred forty".