21111012210211 has 12 divisors (see below), whose sum is σ = 26519618645296. Its totient is φ = 16450139383920.

The previous prime is 21111012210209. The next prime is 21111012210259. The reversal of 21111012210211 is 11201221011112.

It is not a de Polignac number, because 21111012210211 - 2¹ = 21111012210209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111012213211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12462225960 + ... + 12462227653.

Almost surely, 2^{21111012210211} is an apocalyptic number.

21111012210211 is a deficient number, since it is larger than the sum of its proper divisors (5408606435085).

21111012210211 is a wasteful number, since it uses less digits than its factorization.

21111012210211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24924453642 (or 24924453631 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21111012210211 its reverse (11201221011112), we get a palindrome (32312233221323).

The spelling of 21111012210211 in words is "twenty-one trillion, one hundred eleven billion, twelve million, two hundred ten thousand, two hundred eleven".