211221222111201 has 4 divisors (see below), whose sum is σ = 281628296148272. Its totient is φ = 140814148074132.

The previous prime is 211221222111187. The next prime is 211221222111227. The reversal of 211221222111201 is 102111222122112.

211221222111201 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 211221222111201 - 2²⁶ = 211221155002337 is a prime.

It is a super-2 number, since 2×211221222111201² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211221222111401) 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, 35203537018531 + ... + 35203537018536.

It is an arithmetic number, because the mean of its divisors is an integer number (70407074037068).

Almost surely, 2^{211221222111201} is an apocalyptic number.

It is an amenable number.

211221222111201 is a deficient number, since it is larger than the sum of its proper divisors (70407074037071).

211221222111201 is an equidigital number, since it uses as much as digits as its factorization.

211221222111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70407074037070.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 211221222111201 its reverse (102111222122112), we get a palindrome (313332444233313).

The spelling of 211221222111201 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, two hundred one".