221231330111 has 4 divisors (see below), whose sum is σ = 241343269224. Its totient is φ = 201119391000.

The previous prime is 221231330107. The next prime is 221231330113. The reversal of 221231330111 is 111033132122.

It is a happy number.

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

It is not a de Polignac number, because 221231330111 - 2² = 221231330107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221231330113) 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, 10055969540 + ... + 10055969561.

It is an arithmetic number, because the mean of its divisors is an integer number (60335817306).

Almost surely, 2^221231330111 is an apocalyptic number.

221231330111 is a deficient number, since it is larger than the sum of its proper divisors (20111939113).

221231330111 is a wasteful number, since it uses less digits than its factorization.

221231330111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20111939112.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 221231330111 its reverse (111033132122), we get a palindrome (332264462233).

The spelling of 221231330111 in words is "two hundred twenty-one billion, two hundred thirty-one million, three hundred thirty thousand, one hundred eleven".