123201021042440 has 256 divisors, whose sum is σ = 326542114160640. Its totient is φ = 41366730240000.

The previous prime is 123201021042439. The next prime is 123201021042461. The reversal of 123201021042440 is 44240120102321.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 125312057 + ... + 126291383.

It is an arithmetic number, because the mean of its divisors is an integer number (1275555133440).

Almost surely, 2^{123201021042440} is an apocalyptic number.

123201021042440 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 123201021042440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163271057080320).

123201021042440 is an abundant number, since it is smaller than the sum of its proper divisors (203341093118200).

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

123201021042440 is a wasteful number, since it uses less digits than its factorization.

123201021042440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979804 (or 979800 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 123201021042440 its reverse (44240120102321), we get a palindrome (167441141144761).

The spelling of 123201021042440 in words is "one hundred twenty-three trillion, two hundred one billion, twenty-one million, forty-two thousand, four hundred forty".