211020222212221 has 4 divisors (see below), whose sum is σ = 211022670300444. Its totient is φ = 211017774124000.

The previous prime is 211020222212197. The next prime is 211020222212227. The reversal of 211020222212221 is 122212222020112.

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 33071585624100 + 177948636588121 = 5750790^2 + 13339739^2 .

It is a cyclic number.

It is not a de Polignac number, because 211020222212221 - 2²⁷ = 211020087994493 is a prime.

It is a super-2 number, since 2×211020222212221² (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 = 211020222212192 and 211020222212201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020222212227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1223914810 + ... + 1224087211.

It is an arithmetic number, because the mean of its divisors is an integer number (52755667575111).

Almost surely, 2^{211020222212221} is an apocalyptic number.

It is an amenable number.

211020222212221 is a deficient number, since it is larger than the sum of its proper divisors (2448088223).

211020222212221 is an equidigital number, since it uses as much as digits as its factorization.

211020222212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448088222.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 211020222212221 its reverse (122212222020112), we get a palindrome (333232444232333).

The spelling of 211020222212221 in words is "two hundred eleven trillion, twenty billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".