21200012118181 has 16 divisors (see below), whose sum is σ = 23800598373888. Its totient is φ = 18750471336000.

The previous prime is 21200012118163. The next prime is 21200012118221. The reversal of 21200012118181 is 18181121000212.

It is a cyclic number.

It is not a de Polignac number, because 21200012118181 - 2¹¹ = 21200012116133 is a prime.

It is a super-2 number, since 2×21200012118181² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200012118881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260382511 + ... + 260463916.

It is an arithmetic number, because the mean of its divisors is an integer number (1487537398368).

Almost surely, 2^{21200012118181} is an apocalyptic number.

It is an amenable number.

21200012118181 is a deficient number, since it is larger than the sum of its proper divisors (2600586255707).

21200012118181 is a wasteful number, since it uses less digits than its factorization.

21200012118181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520846572.

The product of its (nonzero) digits is 512, while the sum is 28.

Adding to 21200012118181 its reverse (18181121000212), we get a palindrome (39381133118393).

The spelling of 21200012118181 in words is "twenty-one trillion, two hundred billion, twelve million, one hundred eighteen thousand, one hundred eighty-one".