211221100200121 has 4 divisors (see below), whose sum is σ = 230423018400144. Its totient is φ = 192019182000100.

The previous prime is 211221100200059. The next prime is 211221100200151. The reversal of 211221100200121 is 121002001122112.

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 not a de Polignac number, because 211221100200121 - 2¹⁵ = 211221100167353 is a prime.

It is a super-2 number, since 2×211221100200121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211221100200095 and 211221100200104.

It is not an unprimeable number, because it can be changed into a prime (211221100200151) 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, 9600959099995 + ... + 9600959100016.

It is an arithmetic number, because the mean of its divisors is an integer number (57605754600036).

Almost surely, 2^{211221100200121} is an apocalyptic number.

It is an amenable number.

211221100200121 is a deficient number, since it is larger than the sum of its proper divisors (19201918200023).

211221100200121 is a wasteful number, since it uses less digits than its factorization.

211221100200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19201918200022.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211221100200121 its reverse (121002001122112), we get a palindrome (332223101322233).

The spelling of 211221100200121 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred million, two hundred thousand, one hundred twenty-one".