123011321440 has 192 divisors, whose sum is σ = 338092610688. Its totient is φ = 41420390400.

The previous prime is 123011321423. The next prime is 123011321471. The reversal of 123011321440 is 44123110321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72486672 + ... + 72488368.

It is an arithmetic number, because the mean of its divisors is an integer number (1760899014).

Almost surely, 2^123011321440 is an apocalyptic number.

123011321440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123011321440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169046305344).

123011321440 is an abundant number, since it is smaller than the sum of its proper divisors (215081289248).

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

123011321440 is a wasteful number, since it uses less digits than its factorization.

123011321440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841 (or 2833 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 123011321440 its reverse (44123110321), we get a palindrome (167134431761).

The spelling of 123011321440 in words is "one hundred twenty-three billion, eleven million, three hundred twenty-one thousand, four hundred forty".