21002222220211 has 4 divisors (see below), whose sum is σ = 22237647056712. Its totient is φ = 19766797383712.

The previous prime is 21002222220073. The next prime is 21002222220227. The reversal of 21002222220211 is 11202222220012.

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 21002222220211 - 2²⁵ = 21002188665779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002222220241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 617712418225 + ... + 617712418258.

It is an arithmetic number, because the mean of its divisors is an integer number (5559411764178).

Almost surely, 2^{21002222220211} is an apocalyptic number.

21002222220211 is a deficient number, since it is larger than the sum of its proper divisors (1235424836501).

21002222220211 is a wasteful number, since it uses less digits than its factorization.

21002222220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235424836500.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21002222220211 its reverse (11202222220012), we get a palindrome (32204444440223).

The spelling of 21002222220211 in words is "twenty-one trillion, two billion, two hundred twenty-two million, two hundred twenty thousand, two hundred eleven".