21211222220011 has 16 divisors (see below), whose sum is σ = 21538328706720. Its totient is φ = 20885931832320.

The previous prime is 21211222219997. The next prime is 21211222220021. The reversal of 21211222220011 is 11002222211212.

It is a cyclic number.

It is not a de Polignac number, because 21211222220011 - 2¹⁹ = 21211221695723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211222220021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30624571 + ... + 31309531.

It is an arithmetic number, because the mean of its divisors is an integer number (1346145544170).

Almost surely, 2^{21211222220011} is an apocalyptic number.

21211222220011 is a deficient number, since it is larger than the sum of its proper divisors (327106486709).

21211222220011 is an equidigital number, since it uses as much as digits as its factorization.

21211222220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686286.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21211222220011 its reverse (11002222211212), we get a palindrome (32213444431223).

The spelling of 21211222220011 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred twenty thousand, eleven".