12205030155 has 32 divisors (see below), whose sum is σ = 20393303040. Its totient is φ = 6221381760.

The previous prime is 12205030127. The next prime is 12205030157. The reversal of 12205030155 is 55103050221.

It is a happy number.

It is not a de Polignac number, because 12205030155 - 2⁶ = 12205030091 is a prime.

It is a super-2 number, since 2×12205030155² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12205030157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 441645 + ... + 468465.

It is an arithmetic number, because the mean of its divisors is an integer number (637290720).

Almost surely, 2^12205030155 is an apocalyptic number.

12205030155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12205030155 is a deficient number, since it is larger than the sum of its proper divisors (8188272885).

12205030155 is a wasteful number, since it uses less digits than its factorization.

12205030155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28171.

The product of its (nonzero) digits is 1500, while the sum is 24.

Adding to 12205030155 its reverse (55103050221), we get a palindrome (67308080376).

The spelling of 12205030155 in words is "twelve billion, two hundred five million, thirty thousand, one hundred fifty-five".