221021211222011 has 4 divisors (see below), whose sum is σ = 221021241558000. Its totient is φ = 221021180886024.

The previous prime is 221021211221989. The next prime is 221021211222041. The reversal of 221021211222011 is 110222112120122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 221021211222011 - 2¹⁸ = 221021210959867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021211222041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3072305 + ... + 21248093.

It is an arithmetic number, because the mean of its divisors is an integer number (55255310389500).

Almost surely, 2^{221021211222011} is an apocalyptic number.

221021211222011 is a deficient number, since it is larger than the sum of its proper divisors (30335989).

221021211222011 is a wasteful number, since it uses less digits than its factorization.

221021211222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30335988.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221021211222011 its reverse (110222112120122), we get a palindrome (331243323342133).

The spelling of 221021211222011 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, eleven".