123440142121 has 16 divisors (see below), whose sum is σ = 127582801920. Its totient is φ = 119385826560.

The previous prime is 123440142103. The next prime is 123440142131. The reversal of 123440142121 is 121241044321.

It is a cyclic number.

It is not a de Polignac number, because 123440142121 - 2³³ = 114850207529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123440142131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 725605 + ... + 879421.

It is an arithmetic number, because the mean of its divisors is an integer number (7973925120).

Almost surely, 2^123440142121 is an apocalyptic number.

It is an amenable number.

123440142121 is a deficient number, since it is larger than the sum of its proper divisors (4142659799).

123440142121 is a wasteful number, since it uses less digits than its factorization.

123440142121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154104.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 123440142121 its reverse (121241044321), we get a palindrome (244681186442).

The spelling of 123440142121 in words is "one hundred twenty-three billion, four hundred forty million, one hundred forty-two thousand, one hundred twenty-one".