21121120220211 has 24 divisors (see below), whose sum is σ = 35239516092144. Its totient is φ = 12047697807360.

The previous prime is 21121120220197. The next prime is 21121120220219. The reversal of 21121120220211 is 11202202112112.

21121120220211 is a `hidden beast` number, since 2 + 1 + 1 + 211 + 20 + 220 + 211 = 666.

It is not a de Polignac number, because 21121120220211 - 2⁹ = 21121120219699 is a prime.

It is a super-2 number, since 2×21121120220211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121120220219) 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 23 ways as a sum of consecutive naturals, for example, 6274840926 + ... + 6274844291.

It is an arithmetic number, because the mean of its divisors is an integer number (1468313170506).

Almost surely, 2^{21121120220211} is an apocalyptic number.

21121120220211 is a deficient number, since it is larger than the sum of its proper divisors (14118395871933).

21121120220211 is a wasteful number, since it uses less digits than its factorization.

21121120220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12549685251 (or 12549685248 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21121120220211 its reverse (11202202112112), we get a palindrome (32323322332323).

The spelling of 21121120220211 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty million, two hundred twenty thousand, two hundred eleven".