20211236350566 has 16 divisors (see below), whose sum is σ = 40453543026288. Its totient is φ = 6731900396000.

The previous prime is 20211236350561. The next prime is 20211236350597. The reversal of 20211236350566 is 66505363211202.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211236350561) by changing a digit.

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, 1294588425 + ... + 1294604036.

It is an arithmetic number, because the mean of its divisors is an integer number (2528346439143).

Almost surely, 2^{20211236350566} is an apocalyptic number.

20211236350566 is an abundant number, since it is smaller than the sum of its proper divisors (20242306675722).

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

20211236350566 is a wasteful number, since it uses less digits than its factorization.

20211236350566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589193767.

The product of its (nonzero) digits is 388800, while the sum is 42.

Adding to 20211236350566 its reverse (66505363211202), we get a palindrome (86716599561768).

The spelling of 20211236350566 in words is "twenty trillion, two hundred eleven billion, two hundred thirty-six million, three hundred fifty thousand, five hundred sixty-six".