211200022101221 has 4 divisors (see below), whose sum is σ = 211201539035244. Its totient is φ = 211198505167200.

The previous prime is 211200022101217. The next prime is 211200022101293. The reversal of 211200022101221 is 122101220002112.

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 205800858669121 + 5399163432100 = 14345761^2 + 2323610^2 .

It is a cyclic number.

It is not a de Polignac number, because 211200022101221 - 2² = 211200022101217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211200022101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211200022101821) 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 3 ways as a sum of consecutive naturals, for example, 758258150 + ... + 758536631.

It is an arithmetic number, because the mean of its divisors is an integer number (52800384758811).

Almost surely, 2^{211200022101221} is an apocalyptic number.

It is an amenable number.

211200022101221 is a deficient number, since it is larger than the sum of its proper divisors (1516934023).

211200022101221 is a wasteful number, since it uses less digits than its factorization.

211200022101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516934022.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211200022101221 its reverse (122101220002112), we get a palindrome (333301242103333).

The spelling of 211200022101221 in words is "two hundred eleven trillion, two hundred billion, twenty-two million, one hundred one thousand, two hundred twenty-one".