21211200211211 has 8 divisors (see below), whose sum is σ = 22465207186704. Its totient is φ = 19957892048640.

The previous prime is 21211200211147. The next prime is 21211200211219. The reversal of 21211200211211 is 11211200211212.

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

It is not a de Polignac number, because 21211200211211 - 2⁶ = 21211200211147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21211200211211.

It is not an unprimeable number, because it can be changed into a prime (21211200211219) 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, 174640730 + ... + 174762143.

It is an arithmetic number, because the mean of its divisors is an integer number (2808150898338).

Almost surely, 2^{21211200211211} is an apocalyptic number.

21211200211211 is a deficient number, since it is larger than the sum of its proper divisors (1254006975493).

21211200211211 is a wasteful number, since it uses less digits than its factorization.

21211200211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349406461.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21211200211211 its reverse (11211200211212), we get a palindrome (32422400422423).

Subtracting from 21211200211211 its reverse (11211200211212), we obtain a palindrome (9999999999999).

The spelling of 21211200211211 in words is "twenty-one trillion, two hundred eleven billion, two hundred million, two hundred eleven thousand, two hundred eleven".