221020100011 has 4 divisors (see below), whose sum is σ = 228641482800. Its totient is φ = 213398717224.

The previous prime is 221020100009. The next prime is 221020100023. The reversal of 221020100011 is 110001020122.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 221020100011 - 2¹ = 221020100009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221020100071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3810691351 + ... + 3810691408.

It is an arithmetic number, because the mean of its divisors is an integer number (57160370700).

Almost surely, 2^221020100011 is an apocalyptic number.

221020100011 is a deficient number, since it is larger than the sum of its proper divisors (7621382789).

221020100011 is an equidigital number, since it uses as much as digits as its factorization.

221020100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7621382788.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 221020100011 its reverse (110001020122), we get a palindrome (331021120133).

The spelling of 221020100011 in words is "two hundred twenty-one billion, twenty million, one hundred thousand, eleven".