12181020021211 has 32 divisors (see below), whose sum is σ = 13227895296000. Its totient is φ = 11172100939776.

The previous prime is 12181020021193. The next prime is 12181020021223. The reversal of 12181020021211 is 11212002018121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12181020021211 - 2⁵ = 12181020021179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12181020021281) 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, 843144990 + ... + 843159436.

It is an arithmetic number, because the mean of its divisors is an integer number (413371728000).

Almost surely, 2^{12181020021211} is an apocalyptic number.

12181020021211 is a deficient number, since it is larger than the sum of its proper divisors (1046875274789).

12181020021211 is a wasteful number, since it uses less digits than its factorization.

12181020021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17083.

The product of its (nonzero) digits is 128, while the sum is 22.

Adding to 12181020021211 its reverse (11212002018121), we get a palindrome (23393022039332).

The spelling of 12181020021211 in words is "twelve trillion, one hundred eighty-one billion, twenty million, twenty-one thousand, two hundred eleven".