12021541878546 has 160 divisors (see below), whose sum is σ = 28397116313280. Its totient is φ = 3796963288704.

The previous prime is 12021541878497. The next prime is 12021541878553. The reversal of 12021541878546 is 64587814512021.

12021541878546 is a `hidden beast` number, since 1 + 2 + 0 + 2 + 15 + 4 + 1 + 87 + 8 + 546 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 12021541878492 and 12021541878501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 37681276 + ... + 37998968.

It is an arithmetic number, because the mean of its divisors is an integer number (177481976958).

Almost surely, 2^{12021541878546} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12021541878546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14198558156640).

12021541878546 is an abundant number, since it is smaller than the sum of its proper divisors (16375574434734).

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

12021541878546 is a wasteful number, since it uses less digits than its factorization.

12021541878546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317910 (or 317901 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 54.

The spelling of 12021541878546 in words is "twelve trillion, twenty-one billion, five hundred forty-one million, eight hundred seventy-eight thousand, five hundred forty-six".