21211220212211 has 16 divisors (see below), whose sum is σ = 22341232598400. Its totient is φ = 20082574627200.

The previous prime is 21211220212157. The next prime is 21211220212267. The reversal of 21211220212211 is 11221202211212.

It is a cyclic number.

It is not a de Polignac number, because 21211220212211 - 2¹⁰ = 21211220211187 is a prime.

It is a super-3 number, since 3×21211220212211³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211220212291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231287876 + ... + 231379566.

It is an arithmetic number, because the mean of its divisors is an integer number (1396327037400).

Almost surely, 2^{21211220212211} is an apocalyptic number.

21211220212211 is a deficient number, since it is larger than the sum of its proper divisors (1130012386189).

21211220212211 is a wasteful number, since it uses less digits than its factorization.

21211220212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99010.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21211220212211 its reverse (11221202211212), we get a palindrome (32432422423423).

The spelling of 21211220212211 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty million, two hundred twelve thousand, two hundred eleven".