12121525530 has 64 divisors (see below), whose sum is σ = 32335073280. Its totient is φ = 3231306432.

The previous prime is 12121525529. The next prime is 12121525547. The reversal of 12121525530 is 3552512121.

12121525530 is a `hidden beast` number, since 1 + 2 + 121 + 5 + 2 + 5 + 530 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 12121525494 and 12121525503.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1065432 + ... + 1076748.

It is an arithmetic number, because the mean of its divisors is an integer number (505235520).

Almost surely, 2^12121525530 is an apocalyptic number.

12121525530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12121525530 is an abundant number, since it is smaller than the sum of its proper divisors (20213547750).

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

12121525530 is a wasteful number, since it uses less digits than its factorization.

12121525530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15300 (or 15294 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The spelling of 12121525530 in words is "twelve billion, one hundred twenty-one million, five hundred twenty-five thousand, five hundred thirty".