2111201211221 has 4 divisors (see below), whose sum is σ = 2114898586944. Its totient is φ = 2107503835500.

The previous prime is 2111201211211. The next prime is 2111201211257. The reversal of 2111201211221 is 1221121021112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111201211221 is a prime.

It is a super-2 number, since 2×2111201211221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2111201211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111201211211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1848687005 + ... + 1848688146.

It is an arithmetic number, because the mean of its divisors is an integer number (528724646736).

Almost surely, 2^{2111201211221} is an apocalyptic number.

It is an amenable number.

2111201211221 is a deficient number, since it is larger than the sum of its proper divisors (3697375723).

2111201211221 is an equidigital number, since it uses as much as digits as its factorization.

2111201211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3697375722.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2111201211221 its reverse (1221121021112), we get a palindrome (3332322232333).

The spelling of 2111201211221 in words is "two trillion, one hundred eleven billion, two hundred one million, two hundred eleven thousand, two hundred twenty-one".