123206856606121 has 4 divisors (see below), whose sum is σ = 123232745843200. Its totient is φ = 123180967369044.

The previous prime is 123206856606103. The next prime is 123206856606131. The reversal of 123206856606121 is 121606658602321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123206856606121 is a prime.

It is a super-2 number, since 2×123206856606121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123206856606131) 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 3 ways as a sum of consecutive naturals, for example, 12944611401 + ... + 12944620918.

It is an arithmetic number, because the mean of its divisors is an integer number (30808186460800).

Almost surely, 2^{123206856606121} is an apocalyptic number.

It is an amenable number.

123206856606121 is a deficient number, since it is larger than the sum of its proper divisors (25889237079).

123206856606121 is an equidigital number, since it uses as much as digits as its factorization.

123206856606121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25889237078.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 123206856606121 in words is "one hundred twenty-three trillion, two hundred six billion, eight hundred fifty-six million, six hundred six thousand, one hundred twenty-one".