21212111112211 has 8 divisors (see below), whose sum is σ = 22204772379648. Its totient is φ = 20238724821000.

The previous prime is 21212111112209. The next prime is 21212111112263. The reversal of 21212111112211 is 11221111121212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21212111112211 - 2¹ = 21212111112209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212111112271) 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, 4818741805 + ... + 4818746206.

It is an arithmetic number, because the mean of its divisors is an integer number (2775596547456).

Almost surely, 2^{21212111112211} is an apocalyptic number.

21212111112211 is a deficient number, since it is larger than the sum of its proper divisors (992661267437).

21212111112211 is an equidigital number, since it uses as much as digits as its factorization.

21212111112211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9637488113.

The product of its digits is 32, while the sum is 19.

Adding to 21212111112211 its reverse (11221111121212), we get a palindrome (32433222233423).

Subtracting from 21212111112211 its reverse (11221111121212), we obtain a palindrome (9990999990999).

The spelling of 21212111112211 in words is "twenty-one trillion, two hundred twelve billion, one hundred eleven million, one hundred twelve thousand, two hundred eleven".