221442111 has 24 divisors (see below), whose sum is σ = 352157520. Its totient is φ = 132969600.

The previous prime is 221442103. The next prime is 221442149. The reversal of 221442111 is 111244122.

221442111 is a `hidden beast` number, since 221 + 442 + 1 + 1 + 1 = 666.

It is not a de Polignac number, because 221442111 - 2³ = 221442103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221442101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 531 + ... + 21051.

It is an arithmetic number, because the mean of its divisors is an integer number (14673230).

Almost surely, 2^221442111 is an apocalyptic number.

221442111 is a deficient number, since it is larger than the sum of its proper divisors (130715409).

221442111 is a wasteful number, since it uses less digits than its factorization.

221442111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20647 (or 20644 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 221442111 is about 14880.9311200610. The cubic root of 221442111 is about 604.9972551841.

Adding to 221442111 its reverse (111244122), we get a palindrome (332686233).

The spelling of 221442111 in words is "two hundred twenty-one million, four hundred forty-two thousand, one hundred eleven".