21112020331211 has 8 divisors (see below), whose sum is σ = 21184125231360. Its totient is φ = 21039971395968.

The previous prime is 21112020331183. The next prime is 21112020331229. The reversal of 21112020331211 is 11213302021112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112020331211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112020331111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13235396 + ... + 14744481.

It is an arithmetic number, because the mean of its divisors is an integer number (2648015653920).

Almost surely, 2^{21112020331211} is an apocalyptic number.

21112020331211 is a deficient number, since it is larger than the sum of its proper divisors (72104900149).

21112020331211 is a wasteful number, since it uses less digits than its factorization.

21112020331211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27982453.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21112020331211 its reverse (11213302021112), we get a palindrome (32325322352323).

The spelling of 21112020331211 in words is "twenty-one trillion, one hundred twelve billion, twenty million, three hundred thirty-one thousand, two hundred eleven".