821222222011 has 2 divisors, whose sum is σ = 821222222012. Its totient is φ = 821222222010.

The previous prime is 821222221991. The next prime is 821222222147. The reversal of 821222222011 is 110222222128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 821222222011 - 2²³ = 821213833403 is a prime.

It is not a weakly prime, because it can be changed into another prime (821222222411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410611111005 + 410611111006.

It is an arithmetic number, because the mean of its divisors is an integer number (410611111006).

Almost surely, 2^821222222011 is an apocalyptic number.

821222222011 is a deficient number, since it is larger than the sum of its proper divisors (1).

821222222011 is an equidigital number, since it uses as much as digits as its factorization.

821222222011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 25.

Adding to 821222222011 its reverse (110222222128), we get a palindrome (931444444139).

The spelling of 821222222011 in words is "eight hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, eleven".