12191122530 has 24 divisors (see below), whose sum is σ = 31696918812. Its totient is φ = 3250965984.

The previous prime is 12191122519. The next prime is 12191122583. The reversal of 12191122530 is 3522119121.

12191122530 is a `hidden beast` number, since 1 + 2 + 1 + 9 + 1 + 122 + 530 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10261892601 + 1929229929 = 101301^2 + 43923^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12191122494 and 12191122503.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67728369 + ... + 67728548.

Almost surely, 2^12191122530 is an apocalyptic number.

12191122530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12191122530 is an abundant number, since it is smaller than the sum of its proper divisors (19505796282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12191122530 is a wasteful number, since it uses less digits than its factorization.

12191122530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135456930 (or 135456927 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

It can be divided in two parts, 121911 and 22530, that added together give a palindrome (144441).

The spelling of 12191122530 in words is "twelve billion, one hundred ninety-one million, one hundred twenty-two thousand, five hundred thirty".