21220000212111 has 4 divisors (see below), whose sum is σ = 28293333616152. Its totient is φ = 14146666808072.

The previous prime is 21220000212107. The next prime is 21220000212121. The reversal of 21220000212111 is 11121200002212.

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 21220000212111 - 2² = 21220000212107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220000212121) 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, 3536666702016 + ... + 3536666702021.

It is an arithmetic number, because the mean of its divisors is an integer number (7073333404038).

Almost surely, 2^{21220000212111} is an apocalyptic number.

21220000212111 is a deficient number, since it is larger than the sum of its proper divisors (7073333404041).

21220000212111 is an equidigital number, since it uses as much as digits as its factorization.

21220000212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7073333404040.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21220000212111 its reverse (11121200002212), we get a palindrome (32341200214323).

The spelling of 21220000212111 in words is "twenty-one trillion, two hundred twenty billion, two hundred twelve thousand, one hundred eleven".