123011043042 has 16 divisors (see below), whose sum is σ = 249487186752. Its totient is φ = 40426164240.

The previous prime is 123011043041. The next prime is 123011043091. The reversal of 123011043042 is 240340110321.

It is a super-2 number, since 2×123011043042² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123011043041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144378733 + ... + 144379584.

It is an arithmetic number, because the mean of its divisors is an integer number (15592949172).

Almost surely, 2^123011043042 is an apocalyptic number.

123011043042 is an abundant number, since it is smaller than the sum of its proper divisors (126476143710).

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

123011043042 is a wasteful number, since it uses less digits than its factorization.

123011043042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288758393.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 123011043042 its reverse (240340110321), we get a palindrome (363351153363).

The spelling of 123011043042 in words is "one hundred twenty-three billion, eleven million, forty-three thousand, forty-two".