211122220120121 has 4 divisors (see below), whose sum is σ = 223541174244852. Its totient is φ = 198703265995392.

The previous prime is 211122220120117. The next prime is 211122220120139. The reversal of 211122220120121 is 121021022221112.

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 95885516173225 + 115236703946896 = 9792115^2 + 10734836^2 .

It is a cyclic number.

It is not a de Polignac number, because 211122220120121 - 2² = 211122220120117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211122220120093 and 211122220120102.

It is not an unprimeable number, because it can be changed into a prime (211122220020121) 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, 6209477062340 + ... + 6209477062373.

It is an arithmetic number, because the mean of its divisors is an integer number (55885293561213).

Almost surely, 2^{211122220120121} is an apocalyptic number.

It is an amenable number.

211122220120121 is a deficient number, since it is larger than the sum of its proper divisors (12418954124731).

211122220120121 is a wasteful number, since it uses less digits than its factorization.

211122220120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12418954124730.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211122220120121 its reverse (121021022221112), we get a palindrome (332143242341233).

The spelling of 211122220120121 in words is "two hundred eleven trillion, one hundred twenty-two billion, two hundred twenty million, one hundred twenty thousand, one hundred twenty-one".