221211222101011 has 2 divisors, whose sum is σ = 221211222101012. Its totient is φ = 221211222101010.

The previous prime is 221211222100901. The next prime is 221211222101021. The reversal of 221211222101011 is 110101222112122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221211222101011 - 2¹¹ = 221211222098963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221211222101011.

It is not a weakly prime, because it can be changed into another prime (221211222101021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605611050505 + 110605611050506.

It is an arithmetic number, because the mean of its divisors is an integer number (110605611050506).

Almost surely, 2^{221211222101011} is an apocalyptic number.

221211222101011 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211222101011 is an equidigital number, since it uses as much as digits as its factorization.

221211222101011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221211222101011 its reverse (110101222112122), we get a palindrome (331312444213133).

The spelling of 221211222101011 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred one thousand, eleven".