21210222211211 has 32 divisors (see below), whose sum is σ = 23529912350400. Its totient is φ = 18958494528000.

The previous prime is 21210222211193. The next prime is 21210222211271. The reversal of 21210222211211 is 11211222201212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210222211211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210222211271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 840428885 + ... + 840454121.

It is an arithmetic number, because the mean of its divisors is an integer number (735309760950).

Almost surely, 2^{21210222211211} is an apocalyptic number.

21210222211211 is a deficient number, since it is larger than the sum of its proper divisors (2319690139189).

21210222211211 is a wasteful number, since it uses less digits than its factorization.

21210222211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30575.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21210222211211 its reverse (11211222201212), we get a palindrome (32421444412423).

Subtracting from 21210222211211 its reverse (11211222201212), we obtain a palindrome (9999000009999).

The spelling of 21210222211211 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-two million, two hundred eleven thousand, two hundred eleven".