201221100011 has 4 divisors (see below), whose sum is σ = 201442954392. Its totient is φ = 200999245632.

The previous prime is 201221099993. The next prime is 201221100029. The reversal of 201221100011 is 110001122102.

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

It is an interprime number because it is at equal distance from previous prime (201221099993) and next prime (201221100029).

It is a cyclic number.

It is not a de Polignac number, because 201221100011 - 2¹⁰ = 201221098987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201221099965 and 201221100001.

It is not an unprimeable number, because it can be changed into a prime (201221100211) 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 3 ways as a sum of consecutive naturals, for example, 110925830 + ... + 110927643.

It is an arithmetic number, because the mean of its divisors is an integer number (50360738598).

Almost surely, 2^201221100011 is an apocalyptic number.

201221100011 is a deficient number, since it is larger than the sum of its proper divisors (221854381).

201221100011 is an equidigital number, since it uses as much as digits as its factorization.

201221100011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221854380.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 201221100011 its reverse (110001122102), we get a palindrome (311222222113).

The spelling of 201221100011 in words is "two hundred one billion, two hundred twenty-one million, one hundred thousand, eleven".