12021550530 has 64 divisors (see below), whose sum is σ = 32843086848. Its totient is φ = 2787604160.

The previous prime is 12021550517. The next prime is 12021550547. The reversal of 12021550530 is 3505512021.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 12021550530.

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, 784344 + ... + 799523.

It is an arithmetic number, because the mean of its divisors is an integer number (513173232).

Almost surely, 2^12021550530 is an apocalyptic number.

12021550530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12021550530 is an abundant number, since it is smaller than the sum of its proper divisors (20821536318).

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

12021550530 is a wasteful number, since it uses less digits than its factorization.

12021550530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583911.

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

The spelling of 12021550530 in words is "twelve billion, twenty-one million, five hundred fifty thousand, five hundred thirty".