123121010131 has 16 divisors (see below), whose sum is σ = 149597881344. Its totient is φ = 99039324384.

The previous prime is 123121010123. The next prime is 123121010143. The reversal of 123121010131 is 131010121321.

It is a happy number.

It is not a de Polignac number, because 123121010131 - 2³ = 123121010123 is a prime.

It is a super-2 number, since 2×123121010131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123121010231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7205871 + ... + 7222936.

It is an arithmetic number, because the mean of its divisors is an integer number (9349867584).

Almost surely, 2^123121010131 is an apocalyptic number.

123121010131 is a deficient number, since it is larger than the sum of its proper divisors (26476871213).

123121010131 is a wasteful number, since it uses less digits than its factorization.

123121010131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14428890.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 123121010131 its reverse (131010121321), we get a palindrome (254131131452).

The spelling of 123121010131 in words is "one hundred twenty-three billion, one hundred twenty-one million, ten thousand, one hundred thirty-one".