211200123021221 has 8 divisors (see below), whose sum is σ = 211227996188160. Its totient is φ = 211172251717552.

The previous prime is 211200123021193. The next prime is 211200123021247. The reversal of 211200123021221 is 122120321002112.

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

It is a cyclic number.

It is not a de Polignac number, because 211200123021221 - 2²⁶ = 211200055912357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211200123021193 and 211200123021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211200123021421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233966540 + ... + 234867498.

It is an arithmetic number, because the mean of its divisors is an integer number (26403499523520).

Almost surely, 2^{211200123021221} is an apocalyptic number.

It is an amenable number.

211200123021221 is a deficient number, since it is larger than the sum of its proper divisors (27873166939).

211200123021221 is a wasteful number, since it uses less digits than its factorization.

211200123021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931635.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 211200123021221 its reverse (122120321002112), we get a palindrome (333320444023333).

The spelling of 211200123021221 in words is "two hundred eleven trillion, two hundred billion, one hundred twenty-three million, twenty-one thousand, two hundred twenty-one".