21221200110211 has 4 divisors (see below), whose sum is σ = 22143860984592. Its totient is φ = 20298539235832.

The previous prime is 21221200110203. The next prime is 21221200110269. The reversal of 21221200110211 is 11201100212212.

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

It is a cyclic number.

It is not a de Polignac number, because 21221200110211 - 2³ = 21221200110203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221200110911) 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, 461330437156 + ... + 461330437201.

It is an arithmetic number, because the mean of its divisors is an integer number (5535965246148).

Almost surely, 2^{21221200110211} is an apocalyptic number.

21221200110211 is a deficient number, since it is larger than the sum of its proper divisors (922660874381).

21221200110211 is an equidigital number, since it uses as much as digits as its factorization.

21221200110211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922660874380.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221200110211 its reverse (11201100212212), we get a palindrome (32422300322423).

It can be divided in two parts, 212212001 and 10211, that added together give a palindrome (212222212).

The spelling of 21221200110211 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, one hundred ten thousand, two hundred eleven".