221020020011 has 32 divisors (see below), whose sum is σ = 260284876800. Its totient is φ = 183788123904.

The previous prime is 221020020007. The next prime is 221020020071. The reversal of 221020020011 is 110020020122.

It is a happy number.

It is not a de Polignac number, because 221020020011 - 2² = 221020020007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221020019974 and 221020020001.

It is not an unprimeable number, because it can be changed into a prime (221020020071) 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 31 ways as a sum of consecutive naturals, for example, 7828226 + ... + 7856408.

It is an arithmetic number, because the mean of its divisors is an integer number (8133902400).

Almost surely, 2^221020020011 is an apocalyptic number.

221020020011 is a deficient number, since it is larger than the sum of its proper divisors (39264856789).

221020020011 is a wasteful number, since it uses less digits than its factorization.

221020020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28515.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221020020011 its reverse (110020020122), we get a palindrome (331040040133).

The spelling of 221020020011 in words is "two hundred twenty-one billion, twenty million, twenty thousand, eleven".