221221100011 has 8 divisors (see below), whose sum is σ = 237533179104. Its totient is φ = 205275584640.

The previous prime is 221221099963. The next prime is 221221100033. The reversal of 221221100011 is 110001122122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221221100011 - 2¹¹ = 221221097963 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221221099964 and 221221100000.

It is not an unprimeable number, because it can be changed into a prime (221221100041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91639680 + ... + 91642093.

It is an arithmetic number, because the mean of its divisors is an integer number (29691647388).

Almost surely, 2^221221100011 is an apocalyptic number.

221221100011 is a deficient number, since it is larger than the sum of its proper divisors (16312079093).

221221100011 is a wasteful number, since it uses less digits than its factorization.

221221100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183281861.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221221100011 its reverse (110001122122), we get a palindrome (331222222133).

It can be divided in two parts, 22122 and 1100011, that multiplied together give a palindrome (24334443342).

The spelling of 221221100011 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, eleven".