21120220221211 has 16 divisors (see below), whose sum is σ = 21247798560768. Its totient is φ = 20992826080800.

The previous prime is 21120220221179. The next prime is 21120220221251. The reversal of 21120220221211 is 11212202202112.

It is a cyclic number.

It is not a de Polignac number, because 21120220221211 - 2⁵ = 21120220221179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120220221251) 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, 1737282745 + ... + 1737294901.

It is an arithmetic number, because the mean of its divisors is an integer number (1327987410048).

Almost surely, 2^{21120220221211} is an apocalyptic number.

21120220221211 is a deficient number, since it is larger than the sum of its proper divisors (127578339557).

21120220221211 is a wasteful number, since it uses less digits than its factorization.

21120220221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18882.

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

Adding to 21120220221211 its reverse (11212202202112), we get a palindrome (32332422423323).

The spelling of 21120220221211 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty million, two hundred twenty-one thousand, two hundred eleven".