221422345 has 16 divisors (see below), whose sum is σ = 273530880. Its totient is φ = 171964800.

The previous prime is 221422309. The next prime is 221422349. The reversal of 221422345 is 543224122.

It is not a de Polignac number, because 221422345 - 2¹³ = 221414153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221422349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40696 + ... + 45814.

It is an arithmetic number, because the mean of its divisors is an integer number (17095680).

Almost surely, 2^221422345 is an apocalyptic number.

It is an amenable number.

221422345 is a deficient number, since it is larger than the sum of its proper divisors (52108535).

221422345 is a wasteful number, since it uses less digits than its factorization.

221422345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5376.

The product of its digits is 3840, while the sum is 25.

The square root of 221422345 is about 14880.2669666912. The cubic root of 221422345 is about 604.9792538933.

Adding to 221422345 its reverse (543224122), we get a palindrome (764646467).

The spelling of 221422345 in words is "two hundred twenty-one million, four hundred twenty-two thousand, three hundred forty-five".