21000122211211 has 16 divisors (see below), whose sum is σ = 24968718915840. Its totient is φ = 17410161129120.

The previous prime is 21000122211209. The next prime is 21000122211227. The reversal of 21000122211211 is 11211222100012.

It is a cyclic number.

It is not a de Polignac number, because 21000122211211 - 2¹ = 21000122211209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000122212211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 884650791 + ... + 884674528.

It is an arithmetic number, because the mean of its divisors is an integer number (1560544932240).

Almost surely, 2^{21000122211211} is an apocalyptic number.

21000122211211 is a deficient number, since it is larger than the sum of its proper divisors (3968596704629).

21000122211211 is a wasteful number, since it uses less digits than its factorization.

21000122211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769325426.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21000122211211 its reverse (11211222100012), we get a palindrome (32211344311223).

The spelling of 21000122211211 in words is "twenty-one trillion, one hundred twenty-two million, two hundred eleven thousand, two hundred eleven".