221111221011 has 4 divisors (see below), whose sum is σ = 294814961352. Its totient is φ = 147407480672.

The previous prime is 221111221007. The next prime is 221111221031. The reversal of 221111221011 is 110122111122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 221111221011 - 2² = 221111221007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221111221031) 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, 36851870166 + ... + 36851870171.

It is an arithmetic number, because the mean of its divisors is an integer number (73703740338).

Almost surely, 2^221111221011 is an apocalyptic number.

221111221011 is a deficient number, since it is larger than the sum of its proper divisors (73703740341).

221111221011 is an equidigital number, since it uses as much as digits as its factorization.

221111221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73703740340.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221111221011 its reverse (110122111122), we get a palindrome (331233332133).

The spelling of 221111221011 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twenty-one thousand, eleven".