211322042221 has 2 divisors, whose sum is σ = 211322042222. Its totient is φ = 211322042220.

The previous prime is 211322042207. The next prime is 211322042249. The reversal of 211322042221 is 122240223112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196679832196 + 14642210025 = 443486^2 + 121005^2 .

It is a cyclic number.

It is not a de Polignac number, because 211322042221 - 2¹⁹ = 211321517933 is a prime.

It is a super-2 number, since 2×211322042221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211322042192 and 211322042201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211322042021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105661021110 + 105661021111.

It is an arithmetic number, because the mean of its divisors is an integer number (105661021111).

Almost surely, 2^211322042221 is an apocalyptic number.

It is an amenable number.

211322042221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211322042221 is an equidigital number, since it uses as much as digits as its factorization.

211322042221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 211322042221 its reverse (122240223112), we get a palindrome (333562265333).

The spelling of 211322042221 in words is "two hundred eleven billion, three hundred twenty-two million, forty-two thousand, two hundred twenty-one".