21202000111211 has 4 divisors (see below), whose sum is σ = 21202464329232. Its totient is φ = 21201535893192.

The previous prime is 21202000111181. The next prime is 21202000111217. The reversal of 21202000111211 is 11211100020212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202000111211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202000111217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232040495 + ... + 232131848.

It is an arithmetic number, because the mean of its divisors is an integer number (5300616082308).

Almost surely, 2^{21202000111211} is an apocalyptic number.

21202000111211 is a deficient number, since it is larger than the sum of its proper divisors (464218021).

21202000111211 is an equidigital number, since it uses as much as digits as its factorization.

21202000111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464218020.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21202000111211 its reverse (11211100020212), we get a palindrome (32413100131423).

Subtracting from 21202000111211 its reverse (11211100020212), we obtain a palindrome (9990900090999).

The spelling of 21202000111211 in words is "twenty-one trillion, two hundred two billion, one hundred eleven thousand, two hundred eleven".