211020011202221 has 4 divisors (see below), whose sum is σ = 227252319756252. Its totient is φ = 194787702648192.

The previous prime is 211020011202199. The next prime is 211020011202277. The reversal of 211020011202221 is 122202110020112.

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 8332540384996 + 202687470817225 = 2886614^2 + 14236835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211020011202221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211020011202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020011202421) 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, 8116154276996 + ... + 8116154277021.

It is an arithmetic number, because the mean of its divisors is an integer number (56813079939063).

Almost surely, 2^{211020011202221} is an apocalyptic number.

It is an amenable number.

211020011202221 is a deficient number, since it is larger than the sum of its proper divisors (16232308554031).

211020011202221 is a wasteful number, since it uses less digits than its factorization.

211020011202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16232308554030.

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

Adding to 211020011202221 its reverse (122202110020112), we get a palindrome (333222121222333).

The spelling of 211020011202221 in words is "two hundred eleven trillion, twenty billion, eleven million, two hundred two thousand, two hundred twenty-one".