211121212211101 has 4 divisors (see below), whose sum is σ = 211121476843900. Its totient is φ = 211120947578304.

The previous prime is 211121212211083. The next prime is 211121212211111. The reversal of 211121212211101 is 101112212121112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71845101870201 + 139276110340900 = 8476149^2 + 11801530^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121212211101 - 2⁷ = 211121212210973 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 (211121212211111) 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, 131116086 + ... + 132716503.

It is an arithmetic number, because the mean of its divisors is an integer number (52780369210975).

Almost surely, 2^{211121212211101} is an apocalyptic number.

It is an amenable number.

211121212211101 is a deficient number, since it is larger than the sum of its proper divisors (264632799).

211121212211101 is an equidigital number, since it uses as much as digits as its factorization.

211121212211101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264632798.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 211121212211101 its reverse (101112212121112), we get a palindrome (312233424332213).

The spelling of 211121212211101 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred twelve million, two hundred eleven thousand, one hundred one".