221745342 has 64 divisors (see below), whose sum is σ = 557512704. Its totient is φ = 57231360.

The previous prime is 221745317. The next prime is 221745353. The reversal of 221745342 is 243547122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21342 + ... + 29982.

It is an arithmetic number, because the mean of its divisors is an integer number (8711136).

Almost surely, 2^221745342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221745342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278756352).

221745342 is an abundant number, since it is smaller than the sum of its proper divisors (335767362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221745342 is a wasteful number, since it uses less digits than its factorization.

221745342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8713.

The product of its digits is 13440, while the sum is 30.

The square root of 221745342 is about 14891.1162106808. The cubic root of 221745342 is about 605.2732795413.

The spelling of 221745342 in words is "two hundred twenty-one million, seven hundred forty-five thousand, three hundred forty-two".