21201221222211 has 8 divisors (see below), whose sum is σ = 28268335537920. Its totient is φ = 14134127193992.

The previous prime is 21201221222011. The next prime is 21201221222249. The reversal of 21201221222211 is 11222212210212.

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

It is a cyclic number.

It is not a de Polignac number, because 21201221222211 - 2²⁷ = 21201087004483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201221222011) 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, 2438055 + ... + 6953168.

It is an arithmetic number, because the mean of its divisors is an integer number (3533541942240).

Almost surely, 2^{21201221222211} is an apocalyptic number.

21201221222211 is a deficient number, since it is larger than the sum of its proper divisors (7067114315709).

21201221222211 is an equidigital number, since it uses as much as digits as its factorization.

21201221222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10143745.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21201221222211 its reverse (11222212210212), we get a palindrome (32423433432423).

The spelling of 21201221222211 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred eleven".