21102211220211 has 96 divisors (see below), whose sum is σ = 34838062571520. Its totient is φ = 12183720595200.

The previous prime is 21102211220203. The next prime is 21102211220213. The reversal of 21102211220211 is 11202211220112.

21102211220211 is a `hidden beast` number, since 2 + 1 + 10 + 221 + 1 + 220 + 211 = 666.

It is not a de Polignac number, because 21102211220211 - 2³ = 21102211220203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102211220213) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1815862981 + ... + 1815874601.

It is an arithmetic number, because the mean of its divisors is an integer number (362896485120).

Almost surely, 2^{21102211220211} is an apocalyptic number.

21102211220211 is a deficient number, since it is larger than the sum of its proper divisors (13735851351309).

21102211220211 is a wasteful number, since it uses less digits than its factorization.

21102211220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14817 (or 14814 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21102211220211 its reverse (11202211220112), we get a palindrome (32304422440323).

Subtracting from 21102211220211 its reverse (11202211220112), we obtain a palindrome (9900000000099).

The spelling of 21102211220211 in words is "twenty-one trillion, one hundred two billion, two hundred eleven million, two hundred twenty thousand, two hundred eleven".