12345503121 has 24 divisors (see below), whose sum is σ = 20389663424. Its totient is φ = 7051186080.

The previous prime is 12345503119. The next prime is 12345503141. The reversal of 12345503121 is 12130554321.

12345503121 is a `hidden beast` number, since 1 + 2 + 34 + 5 + 503 + 121 = 666.

It is not a de Polignac number, because 12345503121 - 2¹ = 12345503119 is a prime.

It is a super-2 number, since 2×12345503121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12345503101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88275 + ... + 180231.

Almost surely, 2^12345503121 is an apocalyptic number.

It is an amenable number.

12345503121 is a deficient number, since it is larger than the sum of its proper divisors (8044160303).

12345503121 is a wasteful number, since it uses less digits than its factorization.

12345503121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94101 (or 94098 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 12345503121 in words is "twelve billion, three hundred forty-five million, five hundred three thousand, one hundred twenty-one".