123221655205 has 16 divisors (see below), whose sum is σ = 161580412224. Its totient is φ = 89464602880.

The previous prime is 123221655163. The next prime is 123221655211. The reversal of 123221655205 is 502556122321.

It is not a de Polignac number, because 123221655205 - 2¹¹ = 123221653157 is a prime.

It is a super-2 number, since 2×123221655205² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 1856419 + ... + 1921648.

It is an arithmetic number, because the mean of its divisors is an integer number (10098775764).

Almost surely, 2^123221655205 is an apocalyptic number.

It is an amenable number.

123221655205 is a deficient number, since it is larger than the sum of its proper divisors (38358757019).

123221655205 is a wasteful number, since it uses less digits than its factorization.

123221655205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3778676.

The product of its (nonzero) digits is 36000, while the sum is 34.

Adding to 123221655205 its reverse (502556122321), we get a palindrome (625777777526).

The spelling of 123221655205 in words is "one hundred twenty-three billion, two hundred twenty-one million, six hundred fifty-five thousand, two hundred five".