21218482211 has 8 divisors (see below), whose sum is σ = 21307542480. Its totient is φ = 21129605728.

The previous prime is 21218482163. The next prime is 21218482223. The reversal of 21218482211 is 11228481212.

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 21218482211 - 2¹⁰ = 21218481187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21218482291) 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, 187925 + ... + 278841.

It is an arithmetic number, because the mean of its divisors is an integer number (2663442810).

Almost surely, 2^21218482211 is an apocalyptic number.

21218482211 is a deficient number, since it is larger than the sum of its proper divisors (89060269).

21218482211 is an equidigital number, since it uses as much as digits as its factorization.

21218482211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91893.

The product of its digits is 4096, while the sum is 32.

Subtracting from 21218482211 its reverse (11228481212), we obtain a palindrome (9990000999).

The spelling of 21218482211 in words is "twenty-one billion, two hundred eighteen million, four hundred eighty-two thousand, two hundred eleven".