21163122111366 has 40 divisors (see below), whose sum is σ = 47430649792944. Its totient is φ = 7052948931600.

The previous prime is 21163122111349. The next prime is 21163122111367. The reversal of 21163122111366 is 66311122136112.

21163122111366 is a `hidden beast` number, since 2 + 1 + 1 + 63 + 1 + 221 + 11 + 366 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21163122111366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163122111367) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12390885 + ... + 13995008.

Almost surely, 2^{21163122111366} is an apocalyptic number.

21163122111366 is an abundant number, since it is smaller than the sum of its proper divisors (26267527681578).

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

21163122111366 is a wasteful number, since it uses less digits than its factorization.

21163122111366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26390858 (or 26390849 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

Adding to 21163122111366 its reverse (66311122136112), we get a palindrome (87474244247478).

The spelling of 21163122111366 in words is "twenty-one trillion, one hundred sixty-three billion, one hundred twenty-two million, one hundred eleven thousand, three hundred sixty-six".