221440111 has 4 divisors (see below), whose sum is σ = 223399872. Its totient is φ = 219480352.

The previous prime is 221440103. The next prime is 221440123. The reversal of 221440111 is 111044122.

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 221440111 - 2³ = 221440103 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 (221470111) 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, 979711 + ... + 979936.

It is an arithmetic number, because the mean of its divisors is an integer number (55849968).

Almost surely, 2^221440111 is an apocalyptic number.

221440111 is a deficient number, since it is larger than the sum of its proper divisors (1959761).

221440111 is a wasteful number, since it uses less digits than its factorization.

221440111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959760.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 221440111 is about 14880.8639198133. The cubic root of 221440111 is about 604.9954337929.

Adding to 221440111 its reverse (111044122), we get a palindrome (332484233).

The spelling of 221440111 in words is "two hundred twenty-one million, four hundred forty thousand, one hundred eleven".