221443142 has 4 divisors (see below), whose sum is σ = 332164716. Its totient is φ = 110721570.

The previous prime is 221443133. The next prime is 221443153. The reversal of 221443142 is 241344122.

221443142 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55360784 + ... + 55360787.

It is an arithmetic number, because the mean of its divisors is an integer number (83041179).

Almost surely, 2^221443142 is an apocalyptic number.

221443142 is a deficient number, since it is larger than the sum of its proper divisors (110721574).

221443142 is a wasteful number, since it uses less digits than its factorization.

221443142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110721573.

The product of its digits is 1536, while the sum is 23.

The square root of 221443142 is about 14880.9657616702. The cubic root of 221443142 is about 604.9981941070.

Adding to 221443142 its reverse (241344122), we get a palindrome (462787264).

The spelling of 221443142 in words is "two hundred twenty-one million, four hundred forty-three thousand, one hundred forty-two".