12021636534 has 16 divisors (see below), whose sum is σ = 24085985472. Its totient is φ = 4000093448.

The previous prime is 12021636503. The next prime is 12021636541. The reversal of 12021636534 is 43563612021.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12021636495 and 12021636504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1776024 + ... + 1782779.

It is an arithmetic number, because the mean of its divisors is an integer number (1505374092).

Almost surely, 2^12021636534 is an apocalyptic number.

12021636534 is an abundant number, since it is smaller than the sum of its proper divisors (12064348938).

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

12021636534 is a wasteful number, since it uses less digits than its factorization.

12021636534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3559371.

The product of its (nonzero) digits is 25920, while the sum is 33.

The spelling of 12021636534 in words is "twelve billion, twenty-one million, six hundred thirty-six thousand, five hundred thirty-four".