211021101221201 has 8 divisors (see below), whose sum is σ = 212115472680264. Its totient is φ = 209926740049920.

The previous prime is 211021101221143. The next prime is 211021101221219. The reversal of 211021101221201 is 102122101120112.

It can be written as a sum of positive squares in 4 ways, for example, as 6755835441601 + 204265265779600 = 2599199^2 + 14292140^2 .

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 211021101221201 - 2¹⁸ = 211021100959057 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 211021101221201.

It is not an unprimeable number, because it can be changed into a prime (211021101241201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40416305 + ... + 45337841.

It is an arithmetic number, because the mean of its divisors is an integer number (26514434085033).

Almost surely, 2^{211021101221201} is an apocalyptic number.

It is an amenable number.

211021101221201 is a deficient number, since it is larger than the sum of its proper divisors (1094371459063).

211021101221201 is a wasteful number, since it uses less digits than its factorization.

211021101221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5143891.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211021101221201 its reverse (102122101120112), we get a palindrome (313143202341313).

The spelling of 211021101221201 in words is "two hundred eleven trillion, twenty-one billion, one hundred one million, two hundred twenty-one thousand, two hundred one".