21211002220211 has 8 divisors (see below), whose sum is σ = 21483210223440. Its totient is φ = 20939190735232.

The previous prime is 21211002220207. The next prime is 21211002220223. The reversal of 21211002220211 is 11202220011212.

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 21211002220211 - 2² = 21211002220207 is a prime.

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 21211002220211.

It is not an unprimeable number, because it can be changed into a prime (21211002220241) 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, 99021890 + ... + 99235863.

It is an arithmetic number, because the mean of its divisors is an integer number (2685401277930).

Almost surely, 2^{21211002220211} is an apocalyptic number.

21211002220211 is a deficient number, since it is larger than the sum of its proper divisors (272208003229).

21211002220211 is a wasteful number, since it uses less digits than its factorization.

21211002220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198259125.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21211002220211 its reverse (11202220011212), we get a palindrome (32413222231423).

The spelling of 21211002220211 in words is "twenty-one trillion, two hundred eleven billion, two million, two hundred twenty thousand, two hundred eleven".