2121221012211 has 72 divisors (see below), whose sum is σ = 3890776169280. Its totient is φ = 1148330049552.

The previous prime is 2121221012203. The next prime is 2121221012221. The reversal of 2121221012211 is 1122101221212.

2121221012211 is a `hidden beast` number, since 21 + 212 + 210 + 1 + 221 + 1 = 666.

It is not a de Polignac number, because 2121221012211 - 2³ = 2121221012203 is a prime.

It is a super-2 number, since 2×2121221012211² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2121221012221) 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 71 ways as a sum of consecutive naturals, for example, 4461901 + ... + 4914366.

Almost surely, 2^{2121221012211} is an apocalyptic number.

2121221012211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2121221012211 is a deficient number, since it is larger than the sum of its proper divisors (1769555157069).

2121221012211 is an equidigital number, since it uses as much as digits as its factorization.

2121221012211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9376315 (or 9376296 counting only the distinct ones).

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

Adding to 2121221012211 its reverse (1122101221212), we get a palindrome (3243322233423).

The spelling of 2121221012211 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, twelve thousand, two hundred eleven".