12121111530 has 192 divisors, whose sum is σ = 35261111808. Its totient is φ = 2863687680.

The previous prime is 12121111529. The next prime is 12121111543. The reversal of 12121111530 is 3511112121.

12121111530 is a `hidden beast` number, since 1 + 2 + 1 + 21 + 111 + 530 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15680224 + ... + 15680996.

It is an arithmetic number, because the mean of its divisors is an integer number (183651624).

Almost surely, 2^12121111530 is an apocalyptic number.

12121111530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12121111530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17630555904).

12121111530 is an abundant number, since it is smaller than the sum of its proper divisors (23140000278).

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

12121111530 is a wasteful number, since it uses less digits than its factorization.

12121111530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181 (or 1178 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 18.

Adding to 12121111530 its reverse (3511112121), we get a palindrome (15632223651).

The spelling of 12121111530 in words is "twelve billion, one hundred twenty-one million, one hundred eleven thousand, five hundred thirty".