211121202112221 has 8 divisors (see below), whose sum is σ = 281495238215200. Its totient is φ = 140747317042032.

The previous prime is 211121202112199. The next prime is 211121202112243. The reversal of 211121202112221 is 122211202121112.

It is an interprime number because it is at equal distance from previous prime (211121202112199) and next prime (211121202112243).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211121202112221 - 2⁹ = 211121202111709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121202111221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34455271 + ... + 40117428.

It is an arithmetic number, because the mean of its divisors is an integer number (35186904776900).

Almost surely, 2^{211121202112221} is an apocalyptic number.

It is an amenable number.

211121202112221 is a deficient number, since it is larger than the sum of its proper divisors (70374036102979).

211121202112221 is an equidigital number, since it uses as much as digits as its factorization.

211121202112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75516395.

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

Adding to 211121202112221 its reverse (122211202121112), we get a palindrome (333332404233333).

The spelling of 211121202112221 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred two million, one hundred twelve thousand, two hundred twenty-one".