221111211221011 has 8 divisors (see below), whose sum is σ = 221528184696000. Its totient is φ = 220694268245760.

The previous prime is 221111211221003. The next prime is 221111211221029. The reversal of 221111211221011 is 110122112111122.

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 221111211221011 - 2³ = 221111211221003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221111211221011.

It is not an unprimeable number, because it can be changed into a prime (221111211231011) 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, 6914070 + ... + 22136548.

It is an arithmetic number, because the mean of its divisors is an integer number (27691023087000).

Almost surely, 2^{221111211221011} is an apocalyptic number.

221111211221011 is a deficient number, since it is larger than the sum of its proper divisors (416973474989).

221111211221011 is a wasteful number, since it uses less digits than its factorization.

221111211221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15249869.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 221111211221011 its reverse (110122112111122), we get a palindrome (331233323332133).

The spelling of 221111211221011 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred eleven million, two hundred twenty-one thousand, eleven".