221021120012011 has 64 divisors (see below), whose sum is σ = 248878955500416. Its totient is φ = 194593204224000.

The previous prime is 221021120011981. The next prime is 221021120012047. The reversal of 221021120012011 is 110210021120122.

It is not a de Polignac number, because 221021120012011 - 2²¹ = 221021117914859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021120012081) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12188879701 + ... + 12188897833.

It is an arithmetic number, because the mean of its divisors is an integer number (3888733679694).

Almost surely, 2^{221021120012011} is an apocalyptic number.

221021120012011 is a deficient number, since it is larger than the sum of its proper divisors (27857835488405).

221021120012011 is a wasteful number, since it uses less digits than its factorization.

221021120012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19552.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221021120012011 its reverse (110210021120122), we get a palindrome (331231141132133).

It can be divided in two parts, 2210211 and 20012011, that added together give a palindrome (22222222).

The spelling of 221021120012011 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty million, twelve thousand, eleven".