12000661155021 has 32 divisors (see below), whose sum is σ = 21122630489088. Its totient is φ = 5867397354240.

The previous prime is 12000661154971. The next prime is 12000661155029. The reversal of 12000661155021 is 12055116600021.

It is not a de Polignac number, because 12000661155021 - 2¹⁸ = 12000660892877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12000661155021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000661155029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1527964135 + ... + 1527971988.

It is an arithmetic number, because the mean of its divisors is an integer number (660082202784).

Almost surely, 2^{12000661155021} is an apocalyptic number.

12000661155021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12000661155021 is a deficient number, since it is larger than the sum of its proper divisors (9121969334067).

12000661155021 is a wasteful number, since it uses less digits than its factorization.

12000661155021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3055936161.

The product of its (nonzero) digits is 3600, while the sum is 30.

Adding to 12000661155021 its reverse (12055116600021), we get a palindrome (24055777755042).

The spelling of 12000661155021 in words is "twelve trillion, six hundred sixty-one million, one hundred fifty-five thousand, twenty-one".