221021020011 has 16 divisors (see below), whose sum is σ = 321518799360. Its totient is φ = 133938100320.

The previous prime is 221021020009. The next prime is 221021020021. The reversal of 221021020011 is 110020120122.

It is not a de Polignac number, because 221021020011 - 2¹ = 221021020009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221021020001) 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 15 ways as a sum of consecutive naturals, for example, 26580 + ... + 665393.

It is an arithmetic number, because the mean of its divisors is an integer number (20094924960).

Almost surely, 2^221021020011 is an apocalyptic number.

221021020011 is a deficient number, since it is larger than the sum of its proper divisors (100497779349).

221021020011 is a wasteful number, since it uses less digits than its factorization.

221021020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701666.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221021020011 its reverse (110020120122), we get a palindrome (331041140133).

The spelling of 221021020011 in words is "two hundred twenty-one billion, twenty-one million, twenty thousand, eleven".