21211122220111 has 8 divisors (see below), whose sum is σ = 21533259068720. Its totient is φ = 20889148693248.

The previous prime is 21211122220103. The next prime is 21211122220157. The reversal of 21211122220111 is 11102222111212.

It is a happy number.

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 21211122220111 - 2³ = 21211122220103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211122220181) 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, 40568706 + ... + 41088223.

It is an arithmetic number, because the mean of its divisors is an integer number (2691657383590).

Almost surely, 2^{21211122220111} is an apocalyptic number.

21211122220111 is a deficient number, since it is larger than the sum of its proper divisors (322136848609).

21211122220111 is an equidigital number, since it uses as much as digits as its factorization.

21211122220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81660873.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21211122220111 its reverse (11102222111212), we get a palindrome (32313344331323).

The spelling of 21211122220111 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-two million, two hundred twenty thousand, one hundred eleven".